API change: Database.file_path is now a property.
Ignore flymake files (used to perform pylint checking on emacs).
Code cleanup: database.py

Replaced DISPERSY_DEBUG_DATABASE_QUERIES enviromental variable with
--explain-query-plan and --runtime-statistics.

--explain-query-plan will enable the attach_query_plan decorator.
This decorator will run EXPLAIN QUERY PLAN once for every unique query
and output the results to a logger called "explain-query-plan".

--runtime-statistics will enable the attach_runtime_statistics
decorator.  This decorator will count how often the function is called
and how much wall-time was used.  A logger called "runtime-statistics"
will get the results when the python application exits.

Attach_runtime_statistics tracks statistics per string, not per
function (what a profiler does).  The string can be modified based on
the arguments of the function, i.e. for the database we track
different statistics per query by adding the sql statement in the
string.  See pydoc for more info.
Removed unnecessary argument available for the string formatter.
Added documentation to attach_runtime_statistics.