0.5.0 release

[robhrt7]

• Full markdown support for both <markdown> tag and *.md files instead of index.src http://sourcejs.com/docs/markdown
• Watcher for info.json changes to optimize file-tree parser calls (check notes, if you want to revert this feature)
• Specs are now available only by path url like http://sourcejs.com/docs/base, and direct links with index.src, index.md on the end, will point to file source
• Removed unused LESS middleware
• Updated express logger and other improvements

Turned off by default
GitHub authorization integration http://sourcejs.com/docs/auth/

Notes
To turn off new watcher feature, and use cron task for re-indexing navigation, change core.watch.enabled, core.fileTree.mainPageTrigger, core.fileTree.cron in your user/options.js.