Patch for issue #7 (Cisco Spark bug), Fix package bug #8

Added a patch to workaround issue #7, where the Cisco Spark cloud is returning an errant 'max=null' query parameter in the next URLs when paging requests where a max= parameter was not specified.

Fixed bug #8, where the files=[] parameter of the CiscoSparkAPI.messages.create() method was not correctly being treated as an list.