Changing bot name identification from case sensitive to case insensitive

because

* the twitch.tv HTML chat window convert the first letter in all names to uppercase (f.e. "name" is changed to "Name"). Copying the bot name "Name" from that window to address it ("Name what do you think?") fail if we don't match the bot name case insensitive
Merge pull request #2 from john-peterson/case

Changing bot name identification from case sensitive to case insensitive