Add 'request', 'sync' and 'error' events

Fixes #67
if 'server_api' is a callabe, use its result
Merge pull request #107 from LuizArmesto/master

Add 'request', 'sync' and 'error' events
Merge pull request #108 from kilink/master

Allow 'server_api' to be a function that returns an object
added more tests for clientPager module
added skusunam as team member
added skusunam as team member
removed commented lines
removed commented lines
Merge pull request #111 from skusunam/master

Added unit tests for 'clientPager' module
Bump version to 0.5
Split CHANGELOG from README
Update README
Merge pull request #112 from alexandernst/master

Bump version to 0.5
Adding Backbone.Paginator logo to readme.
Fix sorting with negative values.
Second try to fix sorting with negative/0 values.
Merge pull request #113 from alexandernst/master

Fix sorting with negative values
Adding mention of Bower.
Minor tweaks.