install documentation

[KalleJohansson]

propose an update of the documentation of the installation of this module. Remove the deprecated way of including module (via application.conf), point out that you have to run "play dependencies", to actually take use of the module, do an F5 (in Eclipse) to really "import" the modulle into the application, and possibly even restart the application (not sure if there also need for "play ec"), the documentation in it's current state does not really point these thing out clearly.

Just a thought

//Kalle

PS refering to similar experience,
https://groups.google.com/forum/?fromgroups=#!searchin/play-framework/sass/play-framework/2zdSwPP84YU/Jr2lCAOHD4YJ

DS