Implement an extension method for repeating each member of an
Enumerable n times.
* BrainFrontend.cs: Small changes, testing if trying the same word
  multiple times is beneficial as a simple multiple depth search.

* Chainey.cs: Bugfix and removing an unneccesary using declaration.

* Config.cs: Change response chance to 1/300.
Fixing splitting and the detection of quotation marks.
Version bumps.