Issue/4/limit travis deploy to master

[scottescue]

Updating logic gate to prevent project from being deployed when building a pull request. I'm also configuring Travis to only build pushes to master.

Fixes #4.

[coveralls]

Coverage remained the same at 91.265% when pulling ae17215 on issue/4/limit-travis-deploy-to-master into 5e9761d on master.

[coveralls]

Coverage remained the same at 91.265% when pulling 5cde572 on issue/4/limit-travis-deploy-to-master into 5e9761d on master.

[coveralls]

Coverage remained the same at 91.265% when pulling 3e8ef34 on issue/4/limit-travis-deploy-to-master into 5e9761d on master.

[coveralls]

Coverage remained the same at 91.265% when pulling 7b08cb0 on issue/4/limit-travis-deploy-to-master into 5e9761d on master.