add new grok filter with default grok patterns + grok filter tests
update readme with grok info
typo in readme
fix link to patterns dir in readme
typo again
add note of where to find latest patterns
move note of where to find latest patterns
fic travis ci build errors (lint...)
fix travis ci build - remove unused assert in test
more readme (just to start the CI build again that got stuck)
Merge branch 'grok' of github.com:capriza/node-logstash
Improve grok filter
Update libraries, end of Node 0.8 compatibility