proper config with frozen state (with refinement !)
better organisation
handles substract for days (negative value)
:lipstick:
Prepare travis matrix
Add default rake task so travis is happy
Try to fix ActiveSupport 4.1 gemfile
add spec for multiple span
replace refinement with simple function
add tzinfo
Update README.md
fix timezone issues with activesupport 3.2
Monkey Patch Time, DateTime and Date with methods + and -