Add ability to set a single key/value pair to the local config for the test
Added sessionTimeout IOSServer and Selendroid. Added newSessionTimeoutSec and maxIdleBetweenCommands for IOSServer. Added timeoutEmulatorStart and serverStartTimeout for Selendroid.
Commented out serverStartTimeout configuration

* The -serverStartTimeout configuration is NOT
yet available in Selendroid 0.11.0. Hence commenting 
it out for now.