Migration from junit.framework to org.junit

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Merge pull request #142 from oza/not-to-use-deprecated-test-framework

Migration from junit.framework to org.junit
Moving src/main/* to src/main/java/* and src/test/* src/test/java

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>