Get log file path from config file

Change-Id: If27b6c37b2f6207eb5138fab881a62faec5af796
Fixed proxy configuration

Fixed typo in config file that cause a client exception.
Fixed proxy lib to find config information correctly.
Updated logging in proxy lib.
Updated README.textile.
Updated session expiration

Added interval to the proxy lib that terminates client connections
when the session expiration has been passed. Added config file
option to specify the interval time. Added session attribute
"lastAction" to determine the session renewal grace period.