Add circular buffer variance computation
Add variance to the circular buffer docs
Merge pull request #7 from mozilla-services/variance

Variance
Add Mann-Whitney calculation to the circular buffer
Merge branch 'dev' into mann-whitney
Add strftime grammar builder

- raise an error on failed grammar construction instead of returning nil
Merge pull request #9 from mozilla-services/strftime

Add strftime grammar builder
Clean up build grammars by removing some unneeded capture calls
Add Apache CLF grammar generator
Merge branch 'master' into dev
Merge pull request #10 from mozilla-services/apache

Apache grammar generator
Add negated status grammar test for Apache
Fix the Nginx comment
Typo correction
Merge pull request #8 from mozilla-services/mann-whitney

Add Mann-Whitney calculation to the circular buffer
Create an empty metatable for user modules

If a user module is loaded into a global variable the preservation
will restore it to an empty table, wiping out the real module.
Add access to internal data

- initial configuration settings
- column header information
remove unused variable 'seconds_in_minute'
Update the documentation
Merge pull request #15 from bartleusink/unused_variable_seconds_in_minute

remove unused variable 'seconds_in_minute'