parse #EXT-X-KEY tags, and retrieve key URL and IV as per HLS spec
link with as3crypto.swc from https://github.com/timkurvers/as3-crypto
add AES helper class inspired from https://github.com/denivip/osmf-hls-plugin/blob/master/HLSPlugin/src/org/denivip/osmf/utility/decrypt/AES.as
rename variables/methods to avoid any ambiguity as _keystreamloader will be introduced shortly
implement AES-128 decryption
clear playlists are still working ok
but AES playlists not tested at all !!! I have no streams.
fix obvious obvious issues
first AES-128 playlist decrypted successfully ;-)
decryption is quite slow and takes a bunch of CPU (will be moved into a Timer soon)
implement timer for AES decryption (smoother playback)
still some glitch from time to time that needs investigation.
decryption performance is poor as well.
clean-up, remove unused stuff
decrypting is slow
also we got macroblocks at the end of each chunk, not yet clear why, maybe an issue with padding ?
Merge commit '5f70986c8a16aeeaf5424eac39b954d0bdae0f45' into aes
change bandwidth computation logic.
now bandwidth used for adaptation logic is the overall processing bandwidth including loading+decrypting+parsing duration, not only loading duration.
as decrypting takes a bunch of time, this needs to be taken into account to avoid too optimistic level up switching.
merge AES work in master branch

Conflicts:
	build/build.sh
	test/chromeless/HLSProviderChromeless.swf
	test/jwplayer5/HLSProvider5.swf
	test/jwplayer6/HLSProvider6.swf
	test/osmf/HLSProviderOSMF.swf
update build script and swf files after aes merge