Added Javadocs #41
Corrected testBoolean(org.sindice.graphsummary.cascading.TestGraphSummaryConfig)

java.lang.AssertionError: expected:<true> but was:<null>
    at org.junit.Assert.fail(Assert.java:93)
    at org.junit.Assert.failNotEquals(Assert.java:647)
    at org.junit.Assert.assertEquals(Assert.java:128)
    at org.junit.Assert.assertEquals(Assert.java:147)
    at org.sindice.graphsummary.cascading.TestGraphSummaryConfig.testBoolean(TestGraphSummaryConfig.java:71)