core,nTox,toxic - Fix for Issue #453. Refactoring w/astyle.

This commit introduces a few things. Basically I didn't like the fact that
although we had a coding style document, no one was following it. See
https://github.com/irungentoo/ProjectTox-Core/issues/453 for more info regarding
that. This commit just marks the first of my efforts to refactor the code base
according to the posted coding style document by introducing an astylerc and a
optional git pre-commit hook.

I propose that users can add this functionality as a  pre-commit hook. More
info is in the README file.

However, this has only been tested on Linux and I imagine should work on OSX as
well. I don't think pre-commit hooks work on Windows, but I may be mistaken.

The future commits I plan are refactoring the source files for other offending
items such as using typedefs. See http://wiki.tox.im/index.php/Coding_Style.