Added the ability request graph paths which already have the graph-prefix

This is makes it easier to fetch `data.paging._next` and `data.paging._previous`, which provide 'full' urls, and not relative paths.
Added a test for the new ability to request graph paths which already have a graph-prefix
Fix for test of the new ability to request graph paths which already have a graph-prefix
Merge pull request #14 from cimnine/master

Added the ability request graph paths which already have the graph-prefix
Update lib/graph.js

version bump
version bump
Make query parameters work with .del
Merge pull request #18 from arcticmill/master

Make query parameters work with graph.del() - wrong ternary evaluation
version bump
Update README.md

Fixed post authorization redirect path. Also added 'scope' string from config to the getOauthUrl call so the correct permissions are requested. 
Merge pull request #21 from etx/patch-1

Update README.md
Update README.md
Merge pull request #22 from kanakiyajay/patch-1

Update README.md
Added function to extend access token expiration time
code consistency and documentation edits
Merge pull request #28 from zavg/master

Added function to extend access token expiration time
npm version bump
updates
Update README.md