Merge pull request #16 from shrimalmadhur/master

Fixed Issue #14.
Added clone method to copy object properties.

implements necessary functionality of jquery extend, being used currently.
Updating list of contributors
Merge branch 'master' of github.com:Imaginea/uvCharts
refactoring utility methods.

Renamed uv.util.extend to uv.util.inherits.
Now using uv.util.extend as object extending utility method.
Merge pull request #22 from priyankadudani/master

Added clone method to copy object properties. Fixed issue #21
Changes enumerated below
- Added Legends in pie charts
- Fixed issue in getClassName function
- Added custom colour palette config