docs(README): Add david-dm.org devDependencies status image
feat(datepicker): dynamic date format for popup

Closes #1071
refactor(datepicker): removed duplicated css class in a template
fix(pagination): fix altering of current page caused by totals change

Closes #1079
chore(demo): document BS's supported version & link to dependencies

Closes #1093
feat(datepicker): datepicker-append-to-body attribute

Attribute / option specifies where in the DOM to place the datepicker
popup elements.

If this option evaluates to 'true', the datepicker popup elements are
appended to 'body'. Otherwise, they follow the directive element.