Update Gruntfile.js

watch only html demo files
Update Gruntfile.js

bump docs/css in clean task
Update Gruntfile.js

bump compileDocs of less task
Update Gruntfile.js

bump mainDocs of uglify task
Update Gruntfile.js

bump copy:javascripts docs/ task
Update Gruntfile.js

bump deployDocs in shell:deploy task
Update Gruntfile.js

remove 'docs/css/' and 'docs/js/' of bump task
Update ~demo/glyphicons

put livereload script