create postgres helper functions for bash_it
Merge pull request #370 from eddietejeda/postgres_plugin

Fixes #369. Create postgres helper functions for bash_it
grep v2.21 compatibility

grep v2.21 depracates GREP_OPTIONS env var
Merge pull request #373 from nummy/patch-2

grep v2.21 compatibility, closes #371
Merge remote-tracking branch 'upstream/master'