Update lamejs dependency

[isolin]

Working with audio-encoder, I discovered an issue as described here. My colleague reported it and luckily the maintainer of lamejs package released a new version 1.2.1 to fix that.

It would be great if you could update the dependency to the most recent version (1.2.0 -> 1.2.1) so that I don't have to emulate the bugfix manually each time I build.

[isolin]

Update: Secondary issues arouse in lame.js. It will be better to wait for 1.2.2 to fix that.

[isolin]

Besides the issues in lame.js, I noticed the same type of issues with audio-encoder. I needed to add var in encodeMp3.js manually at lines 48, 49, 60 and 61 to flawlessly encode audio. It would be great if these could be updated for future compatibility. I created a pull request for that.

[cstoquer]

I updated lamejs version to 1.2.1 and published audio-encoder on npm with version 1.0.3.
Once a new version of lamejs is released, please reopen this issue and I'll update again.