Add a client API for returning the last-modified time for a table
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                 Key: HBASE-1174
                 URL: https://issues.apache.org/jira/browse/HBASE-1174
             Project: Hadoop HBase
          Issue Type: New Feature
            Reporter: Andrew Purtell
            Priority: Minor


Extend the client API to support querying a table for its last modified time. 
This can be lazily updated in .META. by the HRS, for example, by region. The 
client API can scan the appropriate rows of .META. and choose the most recent 
timestamp. 

Cascading would prefer not to re-run a flow over HBase if the table has not 
been modified since the last one. 

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