Add or improve features

[jgrss]

[jgrss]

Fourier uses NumPy and OpenCV in the inner loops.

[jgrss]

The following features need to be tested on 0.2.0b.

• lbp
• lbpm

The following features have been tested with v. 0.2.0b on OSX.

• dmp
  • OK
• evi2
  • OK
• fourier
  • slow but OK
• gabor
  • seems OK
• hog
  • OK
• gndvi
  • OK
• grad
  • OK, but watch for EGM dynamic range
• lac
  • OK
• lsr
  • OK
• mean
  • OK
• pantex
  • seems OK
• ndvi
  • OK
• orb
  • OK
• saliency
  • TODO: standardize dynamic scale range across tiles
• sfs
  • seems OK