Update changelog for 0.9.0
Added AES-128 encryption support.
0.9.0
Add decryption-related scripts to the dist
Modify grunt to include pkcs7 and the decrypter.
shutdown the sourceBuffer in dispose()
Add test for abort in dispose()
When the player is disposed, we should abort the SourceBuffer.
Merge pull request #153 from videojs/gutworth-dispose-sb

Abort the SourceBuffer when the player is disposed.
Merge pull request #152 from videojs/hotfix/packaging

Add decryption-related scripts to the dist