Merge pull request #7 from lukasoppermann/master

Completely new template.
major rewrite of handkerchief.py

now with easier and proper templates, direct templating from api data
and a lot of cleanup.
fixed a few small things in template
fixed typo
added loading of templates from GitHub by default
offline avatars
whitespace fixes
more efficient avatar storage
fix typo
added authentication option

this allows to avoid failed requests due to GitHubs rate limiting
remove accidentally added files
ignore html files
clarified template and layout

A layout is a set of files in the layouts directory and determines the
visual appearance of the result. The template is one of these files.
updated readme
fixed typos
fixed base64 encoding of avatars

I broke it a few commits ago
do not pass comment data to template

instead presort it and associate it with the correct comments.
fixed bug that broke avatars with local layouts
added labelnames to template data
rewrote default layout, now it is working