Support for Http patch method in RestHelper

[ricsirigu]

Mailing List thread:
https://groups.google.com/forum/#!topic/liftweb/4ByUPd1TMkc

Issue #1873

[farmdawgnation]

Can you please add a test to RestHelperSpec that tests this? There should already be a test in there for OPTIONS so it should be pretty straightforward to add one for PATCH.

[ricsirigu]

@farmdawgnation more tests coming soon

[farmdawgnation]

This LGTM.

If you have more tests you want to add that's fine, but I think this is sufficient for now. We need to improve testing writ large, but this brings the testing up to the level that the rest of it is currently at.

Barring any concerns being surfaced in the next day or so, I'll probably go ahead and merge this.

[ricsirigu]

I would like to write more test but I haven't found the time yet.
If you agree I can send another pull request when more tests will be ready.

[farmdawgnation]

If you agree I can send another pull request when more tests will be ready.

Of course.