Merge pull request #20 from Gillingham/develop

Create ItemRangeOverflow item type
Updated docs
Some fixes in positioning of groups
Added a test example for groups. Added ContentPanel (not yet in use)
Integrated hammer.js in Timeline
Implemented pinching (not yet stable on chrome mobile)
Switched to 2-space indentation
Extended timeline example 04
Switched back to hammer.js 1.0.5 due to issues with 1.0.6
Css file must be loaded explicitly now. Library files moved to `dist`
Some fixes in the build script and tests
Released version 0.3.0
Released version 0.3.0
Added a description on how to publish
Improved overview image
Updated version number to 0.4.0-SNAPSHOT
Fixed a typo
Fixed some typos
Functions `select` and `unselect` on Items working
Implemented function `select` for the Timeline