pickBestFileForHref more flexible

also narrows choice from highest scored tuples by taking
- best ones that are not css (e.g scss/less)
- if that does not help tries exact basename matching
bump libsass to 0.8.6
extra file: file_macher, refactored matching process to smaller methods, one extra spec
also, print a real version here!
another spec for the non-plain-css files in scoredMatching + remove lines
some read me instructions
Merge pull request #15 from mindreframer/master

pickBestFileForHref more flexible