Revert "Lock autoform, collection2 & simple-schema version"

This reverts commit 7c4994f94547f4e930204c0c8b36fab884f6bc4d.
Update autoform to 0.16.1 from 0.14.0
Update collection2 to 0.4.6 from 0.4.2
Update simple-schema to 0.7.0 from 0.5.1
Update race.name valueIsAllowed to custom
Update race.date valueIsAllowed to custom
Update bootstrap3-datepicker to 1.3.0-1 from fork
Use keyErrorMessage instead of invalidKeys.message
Update result.placeGender valueIsAllowed to custom
Update result.placeAgeGroup to custom
Update result.name valueIsAllowed to custom
Update moment to 2.8.1 from 2.6.0
Update race.name custom to autoValue
Align race name & namePath autoValues
Add this.isSet check to name & namePath autoValues
Clean url with collapseWhitespace via autoValue
Delete race.date if empty string
Remove unnecessary conditionally required check
Remove unnecessary valueIsAllowed
Remove unnecessary custom