Happy Numbers in C

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Merge pull request #16 from lkiesow/hn-c

Happy Numbers in C
Merge branch 'master' of https://github.com/lkiesow/codegolf into lkiesow-master

Conflicts:
	happy_number/README.md
Improved Rust version (105 -> 82)
Added Gitter badge
Merge pull request #17 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md
Shortend Erland and Python Version

Signed-off-by: Lars Kiesow <lkiesow@uos.de>