Adding "Plugin Creation" Methods

This is for https://issues.apache.org/jira/browse/CB-4886

i've add 2 new commands.  `create`  and `platform add/remove` , i guess thats technically 3 :) for scaffolding new plugins.

create will create a new plugin and the platform commands will then add that platform to the new plugin,  currently i've only add ios and android as the platforms.