Switched to Emmet NPM package

Some updates and fixes in editor proxy
Insert expanded abbreviation as snippet
Working on context panel
Tweaks in popup styles
Working on live abbreviation preview
Working prototype of live actions
Emmet plugin with recent v1.1 core

* CSP-compliant
* basic support of interactive actions
* multiple caret support
Fixed interactive actions implementation, looks good so far
Added package menu
Removed test file
Fixed package description
Added “Interactive Expand Abbreviation” action to menu
A better looking interactive panel
Removed old experiments
Load user extensions
Improved snippet tabstop generation
Update README.md
Fixed issues with interactive actions
Higher priority to Emmet’s Tab key handler
Merge branch 'master' of github.com:atom/emmet

Conflicts:
	README.md
	keymaps/emmet.cson
	lib/editor-proxy.coffee
	lib/emmet.coffee
	package.json
	vendor/emmet-app.js