Changed Destructor due to ram dump issues. Made it now stop and unload all sources
before deleteing the sources and buffers.

Changed README, small typo.

Issue #225
LowLatencyAudio.getDuration() can crash webworks
-Now added a check to early exit if the file is not present.

Issue #224
LowLatencyAudio.preload() should not succeed for unsupported formats
-Now added a check to see if said file to be preload is present in the
given path, if not early exit.
Merge pull request #238 from khuynh12/master

Changed Destructor due to ram dump issues. Made it now stop and unload a...
Additional guidance on build cycles

Adds instructions to remove and add the plugin on each change so that it's re-installed correctly.
Forgot to add source library file.
Merge pull request #240 from khuynh12/master

Forgot to add source library file.
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