Merge pull request #77 from ssintzz/updateConnectionExceptionLogs

Updating ConnectionGoneAwayException logs to not expose credentials

Removing noisy error log

Adding backtrace to the error log

Updating the pgdata system to include the following: (#79)

Lock and memcache retry to max 100 and 1 second, whichever comes first
Adding an error log when lock takes more than 1 try
Adding an exception when trying to lock on an empty row
Adding function docs

Merge pull request #78 from azimmomin/RemoveSetModeCalls

Remove setMode API and fixing unit tests that reference it.

Merge pull request #75 from zynga/AddRetryOnLocks

Add retry on locks

NO-TICKET: Fixing the base path for xhprof

NO-TICKET: Add get driver by class name

Set override writer to true

Merge pull request #72 from zadirksen/pgdata_override_reader_to_write…

…r_when_fetching_data

NO-TICKET: Adds Using the PGData DB Writer When we Manually Bust a Result Set Cache.