Another attempt at adding the Java API and tests to the travis build

Summary: Adds the Java build and tests to Travis

Test Plan: Make sure that Travis still runs (does currently)

Reviewers: igor, fyrz, sdong

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D43173

.travis.yml

@@ -14,6 +14,6 @@ before_install:
  - sudo dpkg -i libgflags-dev_2.0-1_amd64.deb
 # Lousy hack to disable use and testing of fallocate, which doesn't behave quite
 # as EnvPosixTest::AllocateTest expects within the Travis OpenVZ environment.
-script: OPT=-DTRAVIS V=1 make unity && make clean && OPT=-DTRAVIS V=1 make db_test && ./db_test
+script: OPT=-DTRAVIS V=1 make unity && make clean && OPT=-DTRAVIS V=1 make db_test && ./db_test && OPT=-DTRAVIS V=1 make clean jclean rocksdbjava jtest
 notifications:
     email: false