Letmehear

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No changes, except version bumping up.

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+ Added Py3 support.
+ Now installed into /usr/local/bin/ as letmehear
* Buggy -dry and -debug args renamed into --dry and --debug

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* -dry argument now interpreted as a flag.
* File ext filtering is now case insensitive.
* Now rases exception if unable to read file sample rate.

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+ Added SoX availability check method.

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+ Implemented automatic source resampling.
+ Added backshift length adjustment option.
+ Added ID3Tags removal from resulting files.

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+ Intermediate merged file forma changed to .flac.
+ Chopping progress now is more verbose.
+ Audio speed adjustment is implemented.