ENH: Threshold an image based on a given quantile
BUG: FindJsonCpp wrong library identifier.

libjson.so is provided by the json-c project, not JsonCpp.

Also fix find_package_handle_standard_args variables.

Change-Id: Ia335dfc73f9651ef5ced017ddb4d151b7c7687f5
Merge branch 'JsonCppLibName'

Change-Id: I513b89daab61e5a44dbbf97de5c17e9ec394a41b
Merge branch 'master' of https://github.com/TubeTK/TubeTK into SegmentUsingQuantileThreshold
STYLE: Fixed style issues raised during review
Merge pull request #65 from aylward/SegmentUsingQuantileThreshold

ENH: Threshold an image based on a given quantile