Fixes justjanne#131

Merge pull request justjanne#116 from argoyle/read-all-configs

Accumulate all readable configs

Fix travis build

Merge pull request justjanne#82 from breml/envrc

Allow .envrc for dotenv segment

Merge pull request justjanne#80 from fgaz/master

Add support for nix-shell

Merge pull request justjanne#77 from autarch/autarch/alias-fix

Fix path alias feature to always sort paths by reverse length

Merge pull request justjanne#55 from seph-barker/newline_segment

Add support for newline segment

Fixed an issue with the terminal width detection that was contributed.

Update README and Usage

Fix a broken default, and add kube segment