visualization fixed
SIFT descriptor added
guassian kernel generator added
math dir added, sobel kernel added
getGradient added
Some redundant file deleted, SIFT orientation added
Some useless test files deleted
gradient fixed
Guassian kernel fiexed
SIFT orientation fixed
SIFT detector modified
deleted some old files
Homography estimation
did some testing
camera position in bundler visualization fixed, T = -R't
view frame added to the RegisterView
Use node version of Three.js instead of bower
each camera became its own Object3D
camera's vertex array modified
old code deleted