Slightly refactor header setting in action request.
Better explain return value from Response::__toString().
Further documentation for response classes.
Fixed incorrect spelling of "object"
Merge pull request #1112 from ericcholis/patch-1

Fixed incorrect spelling of "object"
Fixed case of `$this->assertNulL()` to be consistent with PSR-1 camelCase method naming convention.
Merge pull request #1113 from ericcholis/patch-2

Fixed case of assertNulL() method call
Adding test and patch for bug in Router::match with absolute scope
Merge pull request #1115 from koushki/dev

Bug in Router::match using scope
Formatting.
Changing mock namespace of mock_database to database.