Added args logic & other changes

Added:
-Logic to deal with arguments, to accept platforms.
-Logic when no arguments are present, to fail and throw error.
-Support for help argument, to show usage.

Supported platforms (args): --android, --ios, --blackberry10, --wp8,
--windows8.
Removed: top level function for custom copy
Changed:
-Path directory for mobilespec, current location at
cordova-coho/mobilespec.
-link-to instead of copy for mobilespec project.