Add JSON support for output format.

JSON format is good for sharing data with other languages, which makes
it easy to integrate pgBadger's result into other monitoring tools
like Cacti or Graphite.
added query latencey percentile for user level , current percentiles are 90, 95, 99
Fix typon pgbadger call. Thanks to Guilhem Rambal for the report.
fixed issue with float sort
Merge pull request #165 from himanchali/master

Query Latency Percentile on General Activity Page
Replace label "More CPU costly" by "Highest CPU-cost". Thanks to Marc Cousin for the report.
Fix incremental mode where weeks on index page start on sunday and week reports start on monday. Thanks to flopma and birkosan for the report.
- Remove the first empty line
- replace probability by weight

Now it is possible to use the scenario as is with Tsung 1.5
Fix bad URL to documentation. Thanks to Rodolphe Quiedeville for the report.
Merge pull request #170 from rodo/master

Two minor change to made easier to use Tsung scenario
Fix issue with csv log format and incremental mode. Thanks to Suya for the report and the help to solve the issue. There also a fix to support autovacuum statistic with csv format.
Merge branch 'master' of github.com:dalibo/pgbadger
Add execute attribute to pgbadger in the source repository, some may find this more helpful when pgbadger is not installed and executed directly from this repository.
Merge branch 'master' of github.com:lansz/pgbadger into lansz-master
Merge branch 'lansz-master'
Add minimal documentation about JSON output format.
Fix missing database name in samples of top queries reports. Thanks to Thomas Reiss for the report.
Fix overcount of sessions when a client attempts to log in and is kicked off because of failed authentication or an incorrect database name. These show up as sessions which connected and never disconnected. Thanks to Josh Berkus for the report.
Fix remote ssh command error sh: 2: Syntax error: "|" unexpected. Thanks to Herve Werner for the report.
Fix incorrect location of temporary file stroring last parsed line in multiprocess+incremental mode. Thanks to Herve Werner for the report.