Fix phantomjs2 compatibility

[wingedfox]

PhantomJS2 has no phantom.args anymore, System.args should be used.

http://phantomjs.org/api/phantom/property/args.html

[knsv]

Thanks, will take a look.

[agladysh]

+1

[ssbarnea]

I think that this become a critical issue. npm complains about installing an ancient version of phantomjs and even gives an warning regarding package name change:

npm WARN deprecated [email protected]: Package renamed to phantomjs-prebuilt. Please update 'phantomjs' package references to 'phantomjs-prebuilt'

If you happen to have a newer version installed the problem becomes even bigger.

[ssbarnea]

Here is something that may worked, but that is clearly not the desired UX

npm uninstall -g --force phantomjs
npm uninstall -g --force phantomjs-prebuild
npm install -g [email protected]

Not to say that it did take ages to build, because obviously we were not able to benefit from the prebuild versions.

It still takes 100% of 2 cores of a top i7 (ssd), and after 1.5 hours it did not finish yet!

[tylerlong]

We do not use PhantomJS any more. Ref: https://github.com/mermaidjs/mermaid.cli