Add missing angular scenario function

Added iit, xit and ddescribe.
Added node-git.d.ts and tests
Merge pull request #1255 from vvakame/add-node-git

Added node-git.d.ts and tests
Knockout: made sort generic
Merge pull request #1253 from michelsalib/patch-1

Add missing angular scenario function
Merge pull request #1256 from johnnyreilly/master

Knockout: made sort generic