exception handling for missing configuration

[Ali Hürriyetoglu]

if the configuration files are not available, or any error, provide an informative exception as an error message. And exit.

[Ali Hürriyetoglu]

You may check this: http://stackoverflow.com/questions/82831/how-do-i-check-whether-a-file-exists-using-python

[Ali Hürriyetoglu]

Resolved with commit number #13116d4