Merge pull request #3 from hasantayyar/master

Delete confirmation
added #todo comment.
some changes in pull request #3 (thanks to hasantayyar)
added installation section to readme
typo in readme
initial infrastructure of export pattern feature #5
changed attribute template.
implemented sql parsers
added export views
minor fixes in export list stylesheet
implemented export dialog.
added export link to detail view of document.
added asset version functionality
backbone-tastypie moved from utilities.
added github login #2
added octocat
changed social auth settings
changed social auth pipelines
minor changes on "my documents" page.
changed asset version for new updates.