Péter Rabi

Minimalistic Password object implementation.

1

This code intends to close #29 - no further redisign of the API took place but the strictly necessary.

Fix xclip on Travis.

3

I started `Xvfb` and set up the `DISPLAY` environment variable on Travis, so `xclip` tests can be run. Also sorry for chiming in on an earlier pull request by referencing...