chore(grunt): introduce `grunt release` task

A task to simplify the release process:
* version bump
* codename generation
* build
* commit
chore(release): v0.3.4
Merge pull request #94 from andreruffert/release-0.3.4

chore(release): v0.3.4
chore(grunt): consider rangeslider.jquery.json

We now consider rangeslider.jquery.json in the grunt release task.
* version bump
* commit
merge: develop into consider-hidden-elements