Enable travis

Wanted to check with you guys if this is useful.

Basically what we're doing here is verifying all sigs and making sure the repo has green status. This will help on future pull requests - if the build breaks it means someone introduced a bad key or a bad file.

I also found an orphan sig without it's file that was breaking the build and I moved it to orphanSigs dir.

```
$ gpg --verify truecrypt-3.0-source-code.zip.sig
gpg: no signed data
gpg: can't hash datafile: file open error
```

let me know your thoughts and if you need help setting up travis for your repo.