Reporting, Phase I
Merge pull request #314 from x-light/reporting-phase-I

Reporting, Phase I
Tweak reports

* improved i18n
* removed giant sql block in favor of simpler Ruby code
* fixed nesting of haml
* fixed date picker
Make attendance form sharable
Remove old code
Merge pull request #315 from churchio/share-attendance-form

Make attendance form sharable
locale nl-NL updated.
Show previous check-ins.
Improve sharable attendance form for check-in