Use functools.wraps in decorator

[toddsifleet]

• This will ensure that the func_name and doc_strings are correct across py versions
• Fixes issue Python 3 support #2

[pnpnpn]

Did you test this on both python27 and python3?

[toddsifleet]

I did, you may want to checkout travis ci, it could automatically run the tests across multiple python version for every pull request.

Test Output:

tws-test:~/timeout-decorator# nosetests tests
.....
----------------------------------------------------------------------
Ran 5 tests in 3.013s

OK
tws-test:~/timeout-decorator# nosetests-2.7 tests
.....
----------------------------------------------------------------------
Ran 5 tests in 3.009s

OK
tws-test:~/timeout-decorator# nosetests-3.4 tests
.....
----------------------------------------------------------------------
Ran 5 tests in 3.018s

OK