fix #59: (continuation to 'https://github.com/InMobi/conduit/pull/54')
find latest file for each collector
change the order of checks in the condition to avoid redundancy checks
Refactor the test (remove duplicate code)
should not depend on '-' to parse the collector file  and parse the collector file with timestamp regex
remove unused import
Merge pull request #70 from rajubairishetti/Issue-59

Add timestamp metric for last processed file for local, merge and mirror services