Added function addChannel(self,newchan) to config.py

The meaning of this function is to add a new channel to the channel
list available in the config-object
Added a new file confwriter.py

ConfWriter is a class used to write modified config to a file
Expanded functionality in ConfWriter and added exception-checks

Expanded functionality of ConfWriter by adding function writeConfig,
which will write the given config-object into a plaintext file.

Added exception-checking into ConfReader-module in case of failure
with opening the file.
Cleaned up main and made bot utilize ConfReader
Fixed an error with import and cleaned up some comments a bit.
Updated README.md
Added copyright and license notice to confwriter.py
Added IRC and Message-classes and respective files