Added getKeysForLocalStorage method.
Merge pull request #21 from jpmec/master

Added getKeysForLocalStorage method.
Fixed a problem where you couldn't set a cookie after you had removed another one. The problem is that we shouldn't modify the expiry field of the shared cookie object. Now we simply set the expiry date of the removed cookie without touching the cookie object itself.
Add IIFE to avoid introducing global variables

Without the closure provided by the IIFE, angularLocalStorage is a global variable.

The IIFE prevents global variable introduction.
Fixed notices from JSLint
Merge pull request #26 from CaryLandholt/master

Add IIFE to avoid introducing global variables
Merge pull request #22 from mhalttu/master

Fix: You can't set a cookie after you have removed another cookie
Fix returned value when the previously store value was null
Merge branch 'fix-null-values'