add tests for complete/incomplete
Merge pull request #5 from catherinev/pair-kimpossibleg,monicadev

add created_at attribute that defaults to datetime now and make attr_rea...
Merge pull request #4 from catherinev/pair-rickytux,catherinev

add tests for complete/incomplete
there should actually be new tests this time...
Merge pull request #6 from catherinev/pair-rickytux,catherinev

there should actually be new tests this time...
add mark_as_complete! and mark_as_incomplete! methods, allow @status to be complete