Merge pull request #1081 from mojombo/relative-permalinks

Backwards-compatibilize relative permalinks
Update history to reflect merge of #1081.
Merge pull request #1066 from Rowno/data-language

Add a `data-lang` attribute to code blocks
Update history to reflect merge of #1066.
Add documentation about relative_permalinks. #1081
Add note in history about documentation for #1081
Release 1.0.2
Updated language for relative_permalinks
Add docs for gist tag.
Update history to reflect addition of docs for gist tag #1072
Merge branch 'master' into changelist_page
Needed to be issues and not issue in the url. Regenerated file.
Add docs for post excerpt #1072
Fix some language problems, props @maul-esel
When talking about post excerpts, be singular about it.
fix upgrade docs
Fixed shading on notes, made it less apparent.
Merge pull request #1101 from sankage/upgrade-docs

relative permalinks in upgrade docs are reversed
Update history to reflect merge of #1101.
Simplified based on cobyism suggestion.