Conflicts:
	synapse/config/captcha.py

Undo changes to logger config, ie. remove the access_log_file option: decision is to support this through log_config rather tan adding an option.

SYN-161 #resolve

Manually generate the default config yaml, remove most of the commandline arguments for synapse anticipating that people will use the yaml instead. Simpify implementing config options by not requiring the classes to hit the super class