Updated Routing API usage for Laravel 4.1
Route::get(Before|After)Filters -> (before|after)Filters
Added Laravel version check to keep package compatible with 4.0.x branch

Signed-off-by: Sebastian Klaus <sebastian.klaus@aegiscare.com.au>
Added mention of compatibility with 4.0.x and 4.1.x

Signed-off-by: Sebastian Klaus <sebastian.klaus@aegiscare.com.au>
Added version and download count info

Signed-off-by: Sebastian Klaus <sebastian@klaus.com.au>