Refactor application resources (e.g. evidence, namespace, function, etc.) #29

Application resources have two problems:

1. They are grouped in source by their route prefix (e.g. namespace, evidence, completion, etc.). They should be broken in to separate source files named by their type. For example a namespace_value resource type should be located in app/resources/namespace_value.
2. They should be named in plural to correspond with their type name and schema.