add option to override URLStream loader
option can be overrided after HLS is instantiated
it can be overrided until first fragment is loaded
JSURLStream.as :
chunked base64 decoding (timer based - no more video glitch)
use blooddy_crypto.swc 0.3.5 from http://www.blooddy.by/en/crypto/ to optimize base64 decoding performance
report JS fragment loading error to ActionScript
support 2 instances (one used for fragment loading, the other used for key loading)
HLSProviderChromeless.swf : add ability to toggle on/off JS URL Stream Loader