Bumped version of hbase to 0.94.18 #19

Got exception while running tests:
    Caused by: java.lang.RuntimeException: Cached an already cached block
        at
    org.apache.hadoop.hbase.io.hfile.LruBlockCache.cacheBlock(LruBlockCache.java:268)
    ~[hbase-0.92.1.jar:0.92.1]
        at
    org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:276)
    ~[hbase-0.92.1.jar:0.92.1]
        at
    org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.seekToDataBlock(HFileBlockIndex.java:209)
    ~[hbase-0.92.1.jar:0.92.1]
        at
    org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.seekTo(HFileReaderV2.java:519)
    ~[hbase-0.92.1.jar:0.92.1]
        at
    org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.seekTo(HFileReaderV2.java:534)
    ~[hbase-0.92.1.jar:0.92.1]
        at
    org.sindice.core.analytics.cascading.dictionary.HFileDictionary.doGetValue(HFileDictionary.java:138)
    ~[classes/:na]
        at
    org.sindice.core.analytics.cascading.dictionary.HFileDictionary.getValue(HFileDictionary.java:106)
    ~[classes/:na]
        at
    org.sindice.graphsummary.cascading.hash2value.rdf.AbstractDGSRDFExportOperation.decodeLongValue(AbstractDGSRDFExportOperation.java:173)
    ~[classes/:na]
        at
    org.sindice.graphsummary.cascading.hash2value.rdf.RDFPropertiesGraphFunction.operate(RDFPropertiesGraphFunction.java:255)
    ~[classes/:na]
        at
    cascading.flow.stream.FunctionEachStage.receive(FunctionEachStage.java:99)
    ~[cascading-core-2.5.3.jar:na]

Related jira issue https://issues.apache.org/jira/browse/HBASE-8547