Fix #45 - tmuxifier-tmux should not treat -h flag as output help
Bump version to 0.11.3
Remove all argument handling from tmuxifier-tmux

It's meant to be a wrapper for tmux, allowing additional arguments to be
passed. Hence having the wrapper itself intercept -h as previously, or
--help as removed in this commit prevents the wrapper from working
properly.
Bump version to 0.11.4
Basic setup for tests

Based on the test setup of stub.sh: https://github.com/jimeh/stub.sh
Add tests for lib/env.sh
Improve global test setup in test-helper.sh
Fix path related test setup issue
Add tests for lib/runtime.sh
A few further tweaks to how path handling in tests
Add tests for lib/util.sh