Add file aggregation tool

Signed-off-by: Rémi Parain <rparain@ubidreams.com>
add Js Aggregator

Signed-off-by: Rémi Parain <rparain@ubidreams.com>
add Css Aggregator

Signed-off-by: Rémi Parain <rparain@ubidreams.com>
Add Css Minification

Signed-off-by: Rémi Parain <rparain@ubidreams.com>
add Less Compiler

Signed-off-by: Rémi Parain <rparain@ubidreams.com>
add SassCompiler

Signed-off-by: Rémi Parain <rparain@ubidreams.com>