Refactoring: IOCNotificationsSectionHeader
Notifications: Link to repo in header
Markdown parser improvements
TextCell: Don't set text multiple times
Markdown rendering in issues and comments

Closes #225
Bumped beta version
Bump deployment target to iOS 6
Improve Markdown parsing

Closes #395
Refactoring: Markdown parsing
TextCell: return on nil value
Markdown: Fix and add bold italic
Markdown: HTML code blocks
Markdown: Headlines
Bumped beta version to v1.8.1.2
Share exception breakpoint
Refactoring: Remove superfluous imports
Refactoring: Clean up GHOrganizations
Refactoring: Fix association references
Adjust resource failure logging
Fix CGFontRef leaks