unified indent in ext/similie.c
ext/similie.c => ext/similie/fingerprint.c leaving only class methods
adapting for using cache
switch to rspec
use pathname instead of $testdir in specs
caching support
release images earlier and regroup calls in image_fingerprint
split image_fingerprint to multiple methods
image rotation fingerprints (non cached)
cleaned up, fixed and added distance_with_rotation to readme example
fixed cache spec description
use permutation instead of two each cycles in cache spec
spec for first rotation
caching with rotations
optimise when to calculate rotation fingerprints