gitignore - ignore Sublime Text project files

Useful because I use Sublime Text.
gruntfile - don't report minify stats after building

This reduces build time, at the cost of not knowing the gzipped size.
dependencies - remove jQuery UI as a dependency

This commit removes auto-completion as a feature and jQuery UI as
a dependency. This makes the project simpler as auto-completion
wasn't a very core feature, and moreover makes its usage more
palatable to wider use, as re-using other libraries is generally
frowned upon.