Before/After middleware via yaml/xml, supported HTTP methods extended, improved tests and documentation and added route variable converters

[samir-plusb]

Two commits:

• The first commit adds the possibility to specify a before/after route middleware class
• The second commit adds the missing HTTP-request methods. Now the methods 'get', 'put', 'post', 'delete', 'options', 'head', 'patch', 'purge', 'options', 'trace', 'connect' are supported
• The third commit implements the suggestions from Marcos Janssen
• The fourth commit adds the possibility to add route variable converters

[samir-plusb]

ping

[marcojanssen]

will get back to you asap