Add build scripts for running gh-unit using xctool
Add Run Script build phase

Runs the CLI support script for gh-unit if needed
Remove Sidekick-info from copied resources
Fix running tests from command line

Force the main of the test app to run GHTestRunner if CHUNIT_CLI
is specified properly. The solution was proposed in gh-unit issue 96
(https://github.com/gh-unit/gh-unit/issues/96).
Remove trailing >
Ignore build/ directory
Change scheme to be more Travis CI compatible

Change the test scheme to shared and tweak the properties as
suggested here: https://github.com/facebook/xctool#continuous-integration
Add script to .travis.yml

Builds and runs the tests.