Use /usr/bin/env as shebangs for better portability

Add merge command

Use it to merge together two or more documents by hand.

Closes #22

Fix backup restoring via HTTP API

Fixes #21

Update dependencies in setup.py

Fix git version when installing by pypi

Fixes #18

Add support for colorized output by pygments

travis: proper version encoding

Use version from git tags

Travis: add deploy on tags

Bump climb version

Fixes #15