Added extra fields to config.json and zephir init with namespace.

Added extra fields  `name` `description` `author` to config.json .

`config.json` using `json_encode` not string concat, and if PHP above 5.4 , Beautifying json output.

zephir init with namespace argument.
EX. `zephir init test`


Signed-off-by: Rack Lin <racklin@gmail.com>