Copy Function

Begin to write the python copy functions which will call:

_copyFile - https://github.com/Sage-Bionetworks/synapsePythonClient/pull/294
_copyProject - Written
_copyFolder - Written
_copyWiki - Written https://github.com/thomasyu888/synapsePythonClient/blob/develop/synapseclient/client.py
_copyTable - Written https://github.com/thomasyu888/synapsePythonClient/blob/develop/synapseclient/client.py