updt(bootstrap+angularjs): remove angular and update to bootstrap 3.0

-- rewrite from angularJS to jQuery: 90%
-- reformate CSS: 80%

Next Steps:

-- restructure the BPMN 2.0 Modeling reference
-- add search dialog to BPMN 2.0 Modelling reference
-- removal of unused files
-- build up docpad live environment
-- build up new grunt tasks for minification