Update README.md

- replace <br /> by 3 spaces
- make link to apache.org
Merge pull request #53 from wiruzx/readme

Update README.md
Fixed small issue with ZBar and Toxicity's project settings.
Removed background gradient from TXCFriendCells
Updated core, fixed (hopefully) all core api-fix related issues.
Fixed selected background view for friend cells.
Fixed request cells not being made properly. New bug with multiple labels in cells noticed.
Removed redundancy for ZBar headers