Adjusted version number for dev branch
Added OpenGraph tag insertion to single posts
Fixed category orphaning bug

Hyphens in categories are now replaced with en dashes (–) to prevent
being set as a child category with no parent.
Adjusted version number for merge into master

0.5.dev -> 0.5
Merge pull request #2 from ContentLEAD/dev-0.5

Merging in dev changes for v0.5