Change from SenTestingKit STAssert to XCTest XCTAssert.

In ConvertViewControllerTests comment out use of OCMock until fix project error cannot find a header file.
Delete unneeded library search path.
In xcodeproj library search paths change from machine specific to Xcode environment variable $(SRCROOT)

Reference
http://stackoverflow.com/questions/6910901/canonical-list-of-xcode-environment-variables
https://developer.apple.com/library/mac/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html#//apple_ref/doc/uid/TP40003931-CH3-SW38
In xcodeproj library search paths change from machine specific to Xcode environment variable $(SRCROOT)