Update readme with notice about commit to core

Merge pull request #94 from WordPress/release/0.7.0

Bump 0.7.0

Merge pull request #92 from WordPress/concatenation

Restore upstream CodeMirror and use browserify-shim to load global HTMLHint

Bump codemirror version hash

Minify CSS

Downgrade grunt-uglify to same version as core to get preserveComments to work

Uglify JS

Fix passing of linting options

Switch to using XWP fork of CodeMirror to workaround issue with HTMLHint bundling

Use grunt-copy and improve zip building

Import CodeMirror on wp namespace to guard against collisions

Browserify CodeMirror JS into one codemirror bundle, and concat the CSS into a single stylesheet

Update drafted core commit