Apply #88 changes to src/cell.js

These changes were mistakenly applied only to /lib/backgrid.js
Merge pull request #90 from wyuenho/uri-cell-fix

Apply #88 changes to src/cell.js
Merge branch 'master' of https://github.com/wyuenho/backgrid
Merge branch 'gh-pages'
Fix #94 replace echo with printf to make the make files cross-platform
Add newline for #94
Revert PR #90 and PR #88
Update doc on formatter usage
Misc