Use <input type="date"> instead of Bootstrap Datepicker

[normanrz]

Might need to change the date format before sending to backend.

Log Time

[normanrz]

Would close #18

[philippotto]

@normanrz
I gave the native date-input a shot, but it didn't look very "native" to me / didn't fit the bootstrap style (on windows: http://i.imagebanana.com/img/ul9ekuoz/nativetimepicker.png). But maybe one could make it better with some css.

Which benefit could it yield? I closed #18 with a one-liner. So, this shouldn't play a huge role, here.

[normanrz]

I think the date-input is gonna be improved heavily some time soon. You could even style the picker: http://stackoverflow.com/questions/14946091/are-there-any-style-options-for-the-html5-date-picker

I always like to have less dependencies and more native functionality. It's just less to maintain down the road.

It looks quite ok on OS X. But maybe we can just keep this issue on hold and revisit when the browser support is better.