Make update.py test compile examples prior to updating mbed-os version.#3048

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sg- merged 6 commits intoARMmbed:masterfrom

adbridge:master

Nov 1, 2016

Commits on Oct 17, 2016

Make update.py test compile examples prior to updating mbed-os version.
adbridge
committed

Commits on Oct 18, 2016

Review: Update example_lib.py to use rmtree rather than rm system call.
adbridge
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Commits on Oct 25, 2016

Minor review comments plus add new 'compile' option to examples json file.
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committed

Commits on Oct 26, 2016

Update ble example meta data to fix unsupported compilation combinations.
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Commits on Oct 28, 2016