fix(ngTouch): remove ngClick override

This commit removes the ngClick directive from the ngTouch module.
The directive was conceived to remove the 300ms delay
for click events on mobile browsers, by sending a synthetic click event on touchstart.
It also tried to make sure that the original click event that the browser sends after 300ms
was "busted", so that no redundant "ghost-clicks" appear.

There are various reasons why this feature has been removed:

- "This is an ugly, terrible hack!" (says so in the source)
- It is plagued by various bugs that are hard to fix / test for all platforms (see below)
- Simply including ngTouch activates the ngClick override, which means even if you simply want
to use ngSwipe, you may break parts of your app
- There exist alternatives for removing the 300ms delay, that can be used very well with Angular:
[FastClick](https://github.com/ftlabs/fastclick), [Tappy!](https://github.com/filamentgroup/tappy/)
(There's also hammer.js for touch events / gestures)
- The 300ms delay itself is on the way out - Chrome and Firefox for Android remove the 300ms delay
when the usual `<meta name="viewport" content="width=device-width">` is set. In IE, the
`touch-action` css property can be set to `none` or `manipulation` to remove the delay. Finally,
since iOs 8, Safari doesn't delay "slow" taps anymore. There are some caveats though, which can be
found in this excellent article on which this summary is based: http://developer.telerik.com/featured/300-ms-click-delay-ios-8/

Note that this change does not affect the `ngSwipe` directive.

Issues with interactive elements (input, a etc.) when parent element has ngClick:
Closes angular#4030
Closes angular#5307
Closes angular#6001
Closes angular#6432
Closes angular#7231
Closes angular#11358
Closes angular#12082
Closes angular#12153
Closes angular#12392
Closes angular#12545
Closes angular#12867
Closes angular#13213
Closes angular#13558

Other issues:
- incorrect event order
- incorrect event propagation
- ghost-clicks / failing clickbusting with corner cases
- browser specific bugs
- et al.

Closes angular#3296
Closes angular#3347
Closes angular#3447
Closes angular#3999
Closes angular#4428
Closes angular#6251
Closes angular#6330
Closes angular#7134
Closes angular#7935
Closes angular#9724
Closes angular#9744
Closes angular#9872
Closes angular#10211
Closes angular#10366
Closes angular#10918
Closes angular#11197
Closes angular#11261
Closes angular#11342
Closes angular#11577
Closes angular#12150
Closes angular#12317
Closes angular#12455
Closes angular#12734
Closes angular#13122
Closes angular#13272
Closes angular#13447

BREAKING CHANGE:

The `ngClick` override directive from the `ngTouch` module has been removed. This means that on
touch-based devices, users might now experience a 300ms delay before a click event is fired.

If you rely on this behavior, consider using [FastClick](https://github.com/ftlabs/fastclick) or
[Tappy!](https://github.com/filamentgroup/tappy/). Also note that modern browsers remove the 300ms
delay under some circumstances:
- Chrome and Firefox for Android remove the 300ms delay when the well-known `<meta name="viewport" content="width=device-width">` is set
- Internet Explorer removes the delay when  `touch-action` css property is set to `none` or `manipulation`
- Since iOs 8, Safari removes the delay on so-called "slow taps"
See this article for more info on the topic: http://developer.telerik.com/featured/300-ms-click-delay-ios-8/

angularFiles.js

@@ -138,7 +138,6 @@ var angularFiles = {
     'ngTouch': [
       'src/ngTouch/touch.js',
       'src/ngTouch/swipe.js',
-      'src/ngTouch/directive/ngClick.js',
       'src/ngTouch/directive/ngSwipe.js'
     ],
     'ngAria': [

src/ngTouch/touch.js

@@ -7,12 +7,16 @@
  *
  * # ngTouch
  *
- * The `ngTouch` module provides touch events and other helpers for touch-enabled devices.
- * The implementation is based on jQuery Mobile touch event handling
- * ([jquerymobile.com](http://jquerymobile.com/)).
+ * The `ngTouch` module provides the touch-event based {@link ngTouch.$swipe `$swipe`} directive.
  *
+ * <div class="alert alert-info">
+ * Angular 1.5.0 has **removed** the override to the `ngClick` directive that eliminates the 300ms delay
+ * after a tap on mobile browsers. It was removed because the implementation was unreliable, and because
+ * the 300ms delay is on its way out on modern mobile browsers.
+ * If you need this behavior, consider using [FastClick](https://github.com/ftlabs/fastclick) or
+ * [Tappy!](https://github.com/filamentgroup/tappy/)
+ * </div>
  *
- * See {@link ngTouch.$swipe `$swipe`} for usage.
  *
  * <div doc-module-components="ngTouch"></div>
  *