Added development project
Initial work on cocoa pods

Creating a pod spec and adding AFNetworking.
Implement the GuardPost methods

Have methods for email validation and email list parsing.
Adds some unit tests to the GPGuardPost class

There is an integration test here which actually calls the mail gun api.
This will fail because the key i've checked in is fake. Will look at
coming up with a way to fix this.
Updates pod spec in preparation for deployment