fix precompilation
Bump Version, update README

  * due to sprockets digest method, we are forced to use a workaround to allow
  "precompilation" of .dart files, see [non-stupid-digest-assets](https://github.com/alexspeller/non-stupid-digest-assets)
  and [Inability to compile nondigest and digest assets breaks compatibility with bad gems #49](https://github.com/rails/sprockets-rails/issues/49)
  it is optionally (and automatically) available by adding `gem 'non-stupid-digest-assets', '>= 1.1', github: 'm0gg/non-stupid-digest-assets'
` to your Gemfile
  * added dart_app.js to precompile list
  * faced an issue with UglifyJs stackoverflowing with too large dart2js files
Merge remote-tracking branch 'origin/master'

Conflicts:
	README.md