support for user-specified encryption keys and IV from playlist#1

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lfaureyt wants to merge 9 commits intoosklil:masterfrom

lfaureyt:master

Commits on Jul 27, 2013

simpler bin to hex conversion for encryption key, using unpack
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Commits on Jul 30, 2013

Commits on Aug 14, 2013

Commits on Aug 15, 2013

Just moved my name out of the license section.
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Commits on Sep 26, 2013

- fixed format of IV passed to openssl when previously retrieved from
lfaureyt
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Fixed format of IV passed to openssl when previously retrieved from a
lfaureyt
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Merge branch 'master' of https://github.com/lfaureyt/hls-fetch
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