Fixes issue 45: “Twitter not picking up URL”

Patch for https://github.com/filamentgroup/SocialCount/issues/45

Seems like twitter doesn’t like the URL to be encoded, so I removed encodeURIComponent – Not sure if this is the best solution but it works for now.
Merge pull request #49 from peterhry/master

Fixes issue 45: “Twitter not picking up URL”