Closure Unit Tests - goog.net.IframeIo

IframeIo manual tests:
All operations should have no effect on history.
These tests require the ClosureTestServer
to be running with the IframeIoTestServlet.

Simple GET
Simple POST
JSON echo (get)
JSON echo (post)
Test abort

Upload (big files should fail)

Incremental results
Redirect (google.com)
Redirect (/iframeio/ping)
Local request (Win path)
Local request (Linux path)
Out of domain request
Test cache (Date should stay the same for subsequent tests)
Test no-cache
GSE 404 Error
Simulated GFE Error
Simulated Gmail Server Error

Comprehensive Form Post Test:
Text Input
Text Area
Default
Checkbox, default on
Checkbox, default off
Radio: Default, Foo, Bar
Submit this form

TODO(pupius):
- Local timeout