fix ordered lists

* nest code blocks in ordered list
* markdown doesn't support 1.1. form for ordered lists
Merge pull request #1 from karlhorky/master

fix ordered lists
Fixed html markup
oops, fix code blocks in unordered lists
merge conflict from upstream
code indentation in first step
Merge pull request #2 from karlhorky/master

indentation in code blocks
background images
Merge branch 'master' of github.com:splagemann/instaheader
new option
Merge branch 'master' into gh-pages