Revamped SessionService
Added SessionRequestFilter
Merge branch 'master' into feature-sessions
SessionFilter is now both response & request filter
Removed XDebug stub from AdminSite
Changes in DatabaseProfilingService
Fixed error in ErrorPagesResponseFilter
Fixed error in DatabaseService
Added .gitattributes
Fixed problem when parsing doccomment
ErrorPagesResponseFilter improvement

ErrorPagesResponseFilter now automatically tries to load a route whose
name is the status code, if the status code is 400 or more.
Renamed CacheService::activate and deactivate

New names are enable/disable
Address of AdminSite is now /niysu-admin
Added documentation to SessionService
Added tests for SessionService
SessionService now throws on non-existing session
Added documentation in SessionFilter
Added SessionFilterTest stub
Added more tests for SessionFilter
Merge remote-tracking branch 'origin/feature-sessions'

Conflicts:
	src/Niysu/Server.php
	src/Niysu/Services/SessionService.php