Try to describe our coding style using clang-format

How to use:

Install 'git-format-clang' which is part of the clang suite (Fedora:
git-clang-format, openSUSE: clang-tools).

Now do your changes and stage them with `git add`. Once they are staged
format the code using `git clang-format` before you commit.

Now the formatting changed can be viewed with `git diff` against the
staged changes.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

.gitignore

@@ -1,6 +1,5 @@
 *.a
 *.o
-.*
 *.swp
 *~$
 cscope.*