Merge pull request #57 from yacomink/master

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added pr #57 to the changelog
Fixed `NoMethodError` on `pt show`.

When listing stories without the `all` argument a `NoMethodError` is thrown.
Merge pull request #58 from icetan/master

Fixed `NoMethodError` on `pt list`.
0.7.3
When running the command from a directory without a .pt file, try to find the root directory of a git checkout that might contain it
do configs off env vars
more tweaks to allow env vars as global config
and remove a debug statement