FlowFarneback pyramidScale must be < 1

Since it causes a crash, it might be worth it to set it to 0.99 if it's >= 1.

courtesy: 1 character pull request guy
Merge pull request #106 from jefftimesten/patch-1

FlowFarneback pyramidScale must be < 1
added reset to Calibration
Merge pull request #109 from obviousjim/reset-calibration

added reset to Calibration
ContourFinder option to sort contours by size

- new method setSortBySize() allows the user to specify whether
  contours should be sorted by decreasing area.  Not setting this
  flag (or setting it false) keeps the existing behaviour.
Merge pull request #111 from totalgee/sortContours

ContourFinder sorts contours by size; can return a fixed number
Merge branch 'upsstream/master'