TODO

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TODO:
 ✔ try to render frequency enum on server @done (13-04-11 15:09)
 ✔ implement correct calculation for end of the year @done (13-04-11 20:58)
 ✔ support for additional frequencies @done (13-04-12 15:56)
 ✔ improve README @done (13-04-17 16:25)
 ☐ implement "How it works" page
 ☐ contribute back to skeleton

 Improvements:
 ☐ show payment calendar
 ☐ implement better JavaScript tests coverage (e.g. save action)

 UX/UI improvements:
 ☐ better explanation what tool does
 ☐ remove start date from default required field
 ☐ result explanation
 ☐ better validation UI