Add a simple perf test for the stemmer.
Update stemmer to use pre-initialized REGEX vars instead of building them from scratch every time
Merge branch 'pr/124'
Added link to example in README
Build version 0.5.7
Merge branch 'master' of github.com:olivernn/lunr.js

Conflicts:
	lunr.min.js
	package.json
merge remote master