[Feature] - Support both youtube-dl backend and internal backend (old 0.3.x
branch. This makes youtube-dl an optional dependency, though it
is more stable and thus recommended. There will be no more 0.3.x
releases, as this eliminates the need for them.
To use the internal backend even if youtube-dl is installed, set
the environmental variable PAFY_BACKEND to "internal".
[Bugfix] - Fix UnicodeDecodeError(krishnawhite) (129)
[Bugfix] - Fix quality property
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1 January 2016