See docs for usage

Changes:
* Move spec/monkeypatch to spec/support
* Remove unused support/shared_examples
* Move support/api to support/api_helpers to match module name
* Move support/login to support/login_helpers to match module name
* Move API specs to requests/api (convention over configuration)
* Remove unused support/js_patch
* Simplify login_as helper
* Move DatabaseCleaner stuff to its own support file
* Remove unnecessary configuration and requires from spec_helper

Closes #1237

Continues #1222

Closes #1222

Features are still expecting the 1.8 syntax, which is fine in this case.

Didn't bother with files in db/, config/, or features/

Also adds specs to the two affected classes that would have caught my
dumb mistake.

tests references to
* commits
* team members
* issues
* merge requests
* snipptes