MLSQL common-utils

This library is like guava which provides basic util class for other MLSQL related projects.

## for scala 2.11
mvn clean deploy -Prelease-sign-artifacts -Pdisable-java8-doclint

## for scala 2.12

mvn clean deploy -Prelease-sign-artifacts -Pdisable-java8-doclint -Pscala-2.12