feature(auto match): added auto match feature.

This feature allows for auto selecting an item if the search text matches one of the search attributes exactly.
updated README
reworked code to handle matchClass use-case
Merge branch 'master' of github.com:ghiden/angucomplete-alt into feature/auto-match
removed unneeded conditional checks and removed function from scope
added build files
Move checkExactMatch to function section, and remove reference to
scope.results.
Merge branch 'alindber-feature/auto-match'