Add test files

This reverts commit 2a5262c292a110d24009ab9981e430ba4b4a98a0.
Test request handler unbuffered
Ignore prefix header files
Test activity handler checks
Test revenue invalid amount
Move Adjust-Prefix.pch file into test folder
Expect NSUIntegers in NSArray.count tests
Fix some warnings by adding explicit type casts
Renaming of project and tests
Fixed warning unused vars
Fixed gitignore and mis copied folder
Merge pull request #35 from adjust/unit

Unit tests