Config item templatedir should follow the same pattern as other directory config items

[ashcrow]

Currently templatedir is the only item in the configuration system that wants a directory not including the end directory.

{
    ...
    "templatedir": ".",
    "logdir": "./logs",
    "staticdir": "./static"
}

It should be a full directory like the others: Example:

{
    ...
    "templatedir": "./templates",
    "logdir": "./logs",
    "staticdir": "./static"
}

Note: Backwards compatibility should be kept.