Checkbox directive

Added directives sdCheck and sdCheckAll.

SDUX-5
Checkbox directive fix

Fixed a minor bug in sdCheckbox

SDUX-5
Checkbox directive

Rewritten most of sdCheckAll, removed timeouts, changed api.

SDUX-5
Checkbox directive

Fixed minor issues in sdCheckAll.

SDUX-5
Checkbox directive

Fixed minor problems in checkbox directive.

SDUX-5
Checkbox directive

Fixed minor issues in sdCheckAll.

SDUX-5
Checkbox directive

Changed some parts to use faster lodash alternatives.

SDUX-5
Checkbox directive

Fixed a typo.

SDUX-5
Merge pull request #29 from eozan/checkbox-directive

sd-check and sd-check-all directives