Import AES demo
Port AES to SRA's WebCL implementation

Issue #17
Fix of AES Example

Change AES kernel to work with 16 bytes per time and one work-item
oer work-group.
Improve AES Demo

Some changes were made to make this demo more readable.
Implement JS Code for AES

The same algorithm used in WebCL is now used in JS code in order
to compare them.