Rework routing mechanism

[philippguertler]

Currently the routing mechanism works by dynamically changing routes if projects are created, updated or deleted. There are several drawbacks using this method:

• The routes must be synchronized between nodes in the cluster mode
• Some project names conflict (Project routes get invalid when characters appended to project name mesh#369)
• 404 messages cannot be specific (The error message cannot tell the user that the project could not be found)

I propose to not dynamically add routes during runtime. This can be achieved by having the project name as a path parameter in the routes. Doing this would solve the mentioned problems.