Ported the webworks thumbnail extension to cordova plugin
Updated copyrights and modified readme
Updated error in the readme
Fixed error in readme
Added the .so files

Didn't realize that .so files should be included in the project.
Changed copyright to 2012-2014

Changed copyrights to correct years. thumbnail_ndk.cpp and hpp are still
2014 because they are new.
Merge pull request #242 from mkparlee/master

Ported the webworks thumbnail extension to cordova plugin