Make install command
Add CONTRIBUTING based on #15

https://github.com/ginatrapani/todo.txt-cli/issues/15
Also include title
ensure GREP_OPTIONS doesn't break listproj output
Merge pull request #99 from benjaminoakes/master

Add CONTRIBUTING for GitHub integration
Added test case for GREP_OPTIONS
Merge pull request #90 from danohuiginn/master

Make install
Merge pull request #101 from Thann/grep_options_fix

ensure GREP_OPTIONS doesn't break listproj output