disables manual input if JS date/time pickers are used, removed buttons, addresses #537, #538, #539
recompiled
remove private submodule (doesn't belong in public branches)
Merge branch 'minimalistic_date_inputs' of https://github.com/modilabs/enketo

Conflicts:
	.gitmodules
	public/js-min/webform-iframe-all-min.js
	public/js-min/webform-preview-all-min.js
updated bootstrap-timepicker and added it as a git submodule instead
add reset button to JS date, time and date time pickers, closes #542,
updated tests
rebuilt js and css