add classes to settings for javascript interaction

- added reset profile function
update gulp-sass and gulp-uncss
fix show of preview button

preview button was available on tablet size, where it should be hidden.
remove annoying notify for development ;)
added autosave handler
use position fixed instead of absolute
show word counter beside the document name
remove deprecated menu views
fixed calculation of editor height
add solarized dark theme for highlight.js
add toggle word count and night mode

not doing anything yet, though.
Merge branch 'develop' of github.com:mrtnbroder/dillinger into develop
use dev assets instead of production