flag_help() should use RouteMatchInterface, not Request

This is to reflect updates made to hook_help(). Note that the implementation is still @todo.
Merge pull request #26 from md-systems/flag_help-use-routematchinterface

flag_help() should use RouteMatchInterface, not Request
Fix and simplify flag_counts schema
module_invoke_all() has been removed
Merge branch 'module_invoke_all' into allFixes
Merge branch 'master' into allFixes

Conflicts:
	flag.module