require file relatively so during development I can test using `bin/tmuxification create` without having to build and install the gem.
favour .project over .zshrc if it exists
Revert "favour .project over .zshrc if it exists"

This reverts commit c9631b4b83f1158008db8a58f6b6f40bf0dedb85.
Merge branch 'master' of github.com:krisleech/tmuxinator
try appending to a shell agnostic file first