Add data-format attr
Added AMD support
Falling back to data-format attr when no format arg is passed
adding comments and jasmine tests
changed data attribute to data-dateformat, incr version minor number, updated README grunt test cmd, incr node min version umber to 0.8, and added myself to maintainers
Added data-dateformat attribute usage to README
Merge pull request #1 from iamrgon/master

data-dateformat attribute and AMD support