Enabling mvn test command

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Set -Xmx option to avoid Out Of Memory when testing

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Merge pull request #129 from oza/enable-maven-test

Enabling mvn test command