Added unit test for JsonSplitUDF

I had to update jackson libraries because of higher a version in hive-exec, and it requires `jackson-core-asl` classes with version 1.7+ at runtime

    [INFO] +- org.apache.hive:hive-exec:jar:0.10.0:compile
    [INFO] |  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.8.8:compile

while hbase is pulling 1.5.5

    [INFO] +- org.apache.hbase:hbase:jar:0.92.1:compile
    [INFO] |  +- org.codehaus.jackson:jackson-core-asl:jar:1.5.5:compile
    [INFO] |  +- org.codehaus.jackson:jackson-jaxrs:jar:1.5.5:compile
    [INFO] |  +- org.codehaus.jackson:jackson-xc:jar:1.5.5:compile

Although only `jackson-core-asl` had to be updated, I decided it is better to keep them all in sync.