Update README.md

Corrected some typo :)
Merge pull request #78 from arindrakumardas/patch-1

Update README.md
Added some screenshots
Using local copy of jQuery-treetable so expanders could be shown
Merge branch 'master' of git@github.com:piranna/ShareIt.git
Production branch is now a variable
Using update of production branch with merge
Empty message instead of amend and clean-up of repository
Revert ""

This reverts commit ad00bb6b9152e79c3e588f5740bf9e88eec1c378.
Check error after checout to production branch
Checking for errors after merge on production branch
Remove files on error
Remove files variable & 'git commit -a' on merge error
Changed test images folder name to prevent delete images on production
Don't show editor after merge to production branch
Fixed bug re-sending the connection 'answer' message
Added support for oncancel callback
Alert dialog showed before unloading webapp
Policy file loaded only one time