Add Travis CI support to RT2

A few things need to be done before this can be used on a the RemoteTechnologiesGroup/RemoteTech repo (currently in a fully working state for Pezmc/RemoteTech). Closes #56.

1. `repo: Pezmc/RemoteTech` in .travis.yml should be changed to `RemoteTechnologiesGroup/RemoteTech`
2. Someone with RT Group access should create the account over at https://travis-ci.org/ for the organisation
3. ~~The `api_key` in .travis.yml needs to be updated for the RT2 repo. Instructions at [GitHub Releases](http://docs.travis-ci.com/user/deployment/releases/).~~

Note; builds with currently fail for pull requests outside of RemoteTechnologiesGroup as they're not provided with the password to unzip the .dll's. Am still looking for a solution to this problem.

~~In addition, a better solution than GitHub releases should probably be used for storing complete builds, so we're able to point people to the latest pre-release copy. Perhaps we could use S3 or a custom solution where we just push the files to someone's web space.~~

See the update below.