Document and set default HBase table mapping attributes

Currently gora-hbase supports the following, configurable, table mapping attributes:

• String familyName = fieldElement.getAttributeValue("name");
• String compression = fieldElement.getAttributeValue("compression");
• String blockCache = fieldElement.getAttributeValue("blockCache");
• String blockSize = fieldElement.getAttributeValue("blockSize");
• String bloomFilter = fieldElement.getAttributeValue("bloomFilter");
• String maxVersions = fieldElement.getAttributeValue("maxVersions");
• String timeToLive = fieldElement.getAttributeValue("timeToLive");
• String inMemory = fieldElement.getAttributeValue("inMemory");

We do not make this explicit therefore we should not be surprised if no-one seems to know about these.

This issue should add default values for these values to all existing gora-hbase-mapping.xml files and should also document their use, case and effect within the gora-hbase documentation.