added isInteger() function

added isInteger() function to Float
Merge branch 'master' of https://github.com/lucatorella/Pythonic.swift into lucatorella-master
Merge branch 'lucatorella-master'
Added test cases for float.isInteger/is_integer.
Merge branch 'master' of https://github.com/hewigovens/Pythonic.swift into hewigovens-master
Merge branch 'hewigovens-master'
Minor: Added newline at end of file
Now doing s/!/not /g when converting Swift test cases to Python test cases. This allows for simplification of the Swift test cases.
Simplified re.search .
Shortened an excessively long line.
Git now ignores built files.
sys.argv is now read-only.
Added the Python power operator (**).
Added support for: for line in sys.stdin (NSFileHandle extension). Added sys.argv tests.
Added time.time()
Removed redundant function definition - redundant since Int is automatically converted to Double.
Added dict.get(key).
Added dict.has_key(key)
Added dict.pop(key)
Added dict.popitem()