Merge pull request #135 from jmera/master

Add ruby solution for balanced brackets problem, fix minor grammar error...
add merge-sort for go
Merge pull request #136 from Dokko1230/master

add merge-sort for go
Add multiples of 3 or 5 in go
add longest words in go
add shortest fizz buzz in go
Merge pull request #137 from Dokko1230/master

A couple more problems in go