refac(messagerie) - Replace magicsuggest by select2

Select 2 is use in other place. Magicsuggest no.
Keep only one component
refac(stats) - Librairie flot dans un seul js minifié

Ajout de flot dans le bower
Ajout de la minification dans grunt
Remplacement dans le squelette
refac() - Delete unused jquery ui theme

jquery ui is used on fdp, but bootstrap css is apply.
refac() - Concat and minified some CSS component

Use grunt-contrib-cssmin on 5 css to minified theme
refac(tinymyce) - Delete unused plugin

Delete this plugin :
- spellchecker
- template
- insertdatetime
Merge pull request #75 from Armaklan/js-optimize

refac() - Optimize css and js