Merge branch 'xinsong'
some new modifications

background.html added;
secret_keys.js added for twitter;
oauth related files added and manifest.json modified accordingly;
browser_action.html updated
package is now able to load without error
add buttons liked to social networks respecticely

twitter.html now only works as a standalone html page. I need to figure
out how to use the button to redirect inernally from
browser_action.html to twitter.html
got rid of unused files
updated manifest
redid the UI and added basic instagram stuff
instagram stuff works! the model (data link) is functional.
fixed up the background html file.
updated the key because it was causing issues reloading
Added facebook functionality, still some issues though
login_gui.js and model.js for twitter added

secret_keys.js and browser_action.html also modified accordingly
made some small changes to the model for Instagram
Merge branch 'master' of github.com:sheankim/fabula
Cleaned up the source tree. Please don't commit temp files.
FB should work now
fixed small errors in the instagram part
fixed up the html page
removed debugging code from the model
better mechanism for logging out