Add Gruntjs for development

[aprakasa]

Hi Syamil,

Based on my perspective, using Gruntjs for development will be more portable between contributor in the future, just like WordPress did. So I add some simple configuration to do some simple task such as generate .pot file, minify css, js, etc.

Second, I continuing @luizrw great works by updating the text domain, fix some translation strings and generate .pot file (Theme and plugin is kinda different on how they load the translation file). The new translation file name should be: ( e.g aqpb-ms_MY.mo, aqpb-pt_BR.mo, aqpb-id_ID.mo, etc).

Thanks