Fix environment variable issue for testing on device
Remove export logic and update argument parsing flow per pull request feedback
Merge pull request #226 from hongkai/master

Fix environment variable issue for testing on device
Sort the integration test groups alphabetically.
Factor the construction of generic test case views into a reusable category method.

The popover and terminal tests also use generic views but cannot leverage the
category method because they require a reference to the label that's part of the
generic view. Nevertheless, their layout of the label has been updated to fix a
clipping issue discovered in the development of the category method.
Supplement `-[SLStaticElement description]` with the element's UIA representation.
Add a note to `SLTerminal+ConvenienceFunctions.h` about calling functions directly.

As opposed to calling functions using the methods defined in
the `ConvenienceFunctions` category.
Add `SLNavigationBar`.
Add `SLActionSheet`.
Add functions for comparing rects and checking rect containment to `SLGeometry.h`.

And add a missing test for `SLUIARectFromCGRect`.
Support loading functions that take no arguments.
Add `SLMailComposeView`.

To access and manipulate the remote view presented by `MFMailComposeViewController`.