Add createEntity method to EntityManager

Add createEntity method to EntityManager
Merge pull request #390 from Steve-Fenton/patch-1

Add createEntity method to EntityManager
Added logChange to extenders.

Added logChange to extenders.

http://knockoutjs.com/documentation/extenders.html
Merge pull request #393 from Steve-Fenton/patch-2

Added logChange to extenders.
bug fix 'knockout->KnockoutExtenders'
Merge pull request #394 from Diullei/master

bug fix 'knockout->KnockoutExtenders'
Merge pull request #388 from MagicMau/master

Updated Underscore.js and added underscore-ko.js
Added EntityManager.hasChangesChanged event

EntityManager.hasChanges event was renamed to EntityManager.hasChangesChanged in v1.1.0
Update breeze-tests.ts

Changed hasChanges event to hasChangesChanged as it was renamed in v1.1.0
Merge pull request #399 from jlerasmus/master

Added EntityManager.hasChangesChanged event