added initial datetime helpers
added 100% test coverage for datetime_helpers
added circle.yml file
trying to trigger circle
added requirements for circle
updated README
Update README.md

Updated the README for all public functions
removed double main statement in tests
Merge branch 'develop' of github.com:wesleykendall/datetime_helpers into develop
moved main functions into __init__.py and also moved tests into directory
changed the api in favor of combining tz and non tz functions. Also updated all doc strings for google's format
added tests for new date time addition function
made tests for floor function
added tests for unix_time function
added more documentation for each function
updated README to include documentation
updated the README
added a license and manifest
added license to manifest
fixed doc error