add simple plugin system
add simple plugin system
Merge branch 'develop' of github.com:easylogic/summernote into easylogic-develop

Conflicts:
	dist/summernote.js
	dist/summernote.min.js
Merge branch 'easylogic-develop' into develop
Merge branch 'develop' into youtube-as-opaque

Conflicts:
	dist/summernote.js