Stable: Retarget mbed-ls autodetection results via mbedls.json

Changes:

• See new feature description: Retarget mbed-ls autodetection results.
  • Implicit read and parsing of mbedls.json (in current command line execution).
  • Add new --skip-retarget flag.

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Reselased in PyPi, use $ pip install mbed-ls --upgrade to install latest mbed-ls,

Submitting dist\mbed-ls-0.1.29.zip to https://pypi.python.org/pypi
Server response (200): OK