Small find changes

[benogle]

• Fixes "Replace All" should respect selection. It also sho atom#1234 by popping up find panel when cmd-e is pressed
• Fixes When text is highlighted and find is opened, default to the selected text #93 by defaulting to the selected text in the find editor.

[jasonrudolph]

I like how cmd-e doesn't pop-up the find and replace view.

FWIW, I really dig that Atom now pops up the find-and-replace view when you hit cmd+e. 🎁 In fact, I made a note to myself a couple weeks back to consider implementing that functionality myself. I was pretty psyched when I noticed today that it's now present in the latest version of Atom. ⚡