ZEPPELIN-375

[tzolov]

Hot Fix to allow using Zeppelin with the latest (Java 8 based) Geode see: ZEPPELIN-375

Changes:

• Make sure the that the zeppelin-distribution is build after the geode module. By default if you activate the geode profile (-Pgeode) the maven reactor will order the geode after the zeppelin-distribution. In result the geode is never added to the zeppelin binary distro.
• Document how to build Zeppelin with Geode. Note that the only way to use Zeppelin with Geode is to build Zeppelin with Java8

[felixcheung]

should this be enabled in travis?

[tzolov]

@felixcheung, for sure it will be helpful (and useful) if some of the travis builds run on JDK8.
Not sure i can changed it though?

[Leemoonsoo]

Adding a new entry under matrix.include section in the .travis.yml will run test on JDK8.
for example

 - jdk: "oraclejdk8"
env: SPARK_VER="1.6.0" HADOOP_VER="2.3" PROFILE="-Pspark-1.6 -Phadoop-2.3 -Ppyspark -Pscalding" BUILD_FLAG="package -Pbuild-distr" TEST_FLAG="verify -Pusing-packaged-distr"

If the test on jdk8 does not pass, because of other modules of Zeppelin, i suggest revert modification of .travis.yml in this PR and make separate PR and resolve https://issues.apache.org/jira/browse/ZEPPELIN-411

[felixcheung]

@tzolov how would you like to proceed?