Add howm formatter support
Add tzinfo-data as a dependency
I need this to run mhc sync with MHC_TZINFO defined.
Merge pull request #17 from ykasap/howmformatter

Add howm formatter support
Merge pull request #18 from ykasap/tzinfo

Add tzinfo-data as a dependency
ADD user friendly error message
Add calfw formatter
Set product name to iCalendar PRODID
Overwrite on copy when sync strategy is 'mirror'
Increment sequence on mhc-draft-finish
Cosmetic change
Calendar takes default filter
Change configuration scheme
Emit grace exceptions
Update sample configuration