Users can pass their headers in via options['headers']. Non JSON response types are also now supported.
Tests for custom user headers
params already extends options, so it'll automatically get options['headers']. simplifying.
Custom code unit specs
Fixing data type handling by allowing defaults to kick in
Merge branch '0.9.2-wip' into f/cc-response

Conflicts:
	stackmob.js
	test/specs-unit.html
Merge pull request #72 from stackmob/f/cc-response

F/cc response