added Galician translations thanks to Pedro Abalo
fixed #322. added option to disable using a range.
fixed navigating to a different month and/or year
checkpoint
improved date enabling/disabling
Slovenian translations thanks to Jernej
enabling and disabling dates/times fixed with some tests
docs updated
Merge branch 'edge' into dev
Added Icelandic translation
`off` method + disabling overlapped date/time ranges
docs + demos
Merge pull request #333 from Reiknistofa/is-translation

Add Icelandic translation
icelandic translations
travis fix attempt
travis fix attempt
travis fix attempt
travis fix attempt