Add curve filter. (no resource images are required)#229

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wysaid wants to merge 2 commits intocats-oss:masterfrom wysaid:master

+198-5

Commits on Nov 23, 2015

[update by wysaid] Add curve filter. After this commit, the curve filter would not need resource images input any more. The curve algorithm is based on Catmull-Rom Spline
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fix: The view covers the intensity-adjust slider. The zOrderOnTop attrib is not neccessary.
wysaid
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