v0.3.0

• docs
  • Correct Windows build location from same @jpfarias fix to gocv-site
• core
  • Add Resize
  • Add Mat merge and Discrete Fourier Transform
  • Add CopyTo() and Normalize()
  • Implement various important Mat logical operations
• video
  • BackgroundSubtractorMOG2 algorithm now working
  • Add BackgroundSubtractorKNN algorithm from video module
• videoio
  • Add VideoCapture::get
• imgproc
  • Add BilateralFilter and MedianBlur
  • Additional drawing functions implemented
  • Add HoughCircles filter
  • Implement various morphological operations
• highgui
  • Add Trackbar support
• objdetect
  • Add HOGDescriptor
• build
  • Remove race from test on Travis, since it causes CGo segfault in MOG2