Merge pull request #33 from edl00k/master

fixing of receiving picture from opus metadata
Merge pull request #34 from edl00k/master

fixing processing m4a & refusing from gzip
Fixing several retain cycles
fixes #35
Podspec version bump
Using semaphore instead of the current run loop while waiting for cache in HTTPSource
Fixing typo in instance variable name
Refactoring a bit metadata extraction in core audio decoder
Adding custom resolver for the pluging manager
fixes #36
Preventing potential deadlock in HTTPSource
Adding additional guard before parsing metadata for mp3 file with
HTTPSource. This prevents undesirable locks for the corrupted tags and
tags located at the end of the file (for ex. ID3v1)
fixes #26
Using estimated duration for CoreAudio files to avoid full packets scans, on tested files it
gives the same result in most situations.
fixes #26
Version bump in podspec
fixed changing to stopped state after no continuos playback url is given
Merge pull request #38 from onigunn/master

fixed changing to stopped state after no continuos playback url is given