Fix. Handling of user names in user view.  Process error codes.
Add. 'restrict' parameter defintion for threshold and survival metrics.
Mod. re-implement restriction by limiting the revisions considered by time.
Add. USER_THREADS and REVISION_THREADS globals to tune thread counts.
Add. Logging to set_data and get_data.  PEP-8 compliance.
Mod. PEP-8 compliance.
Mod. PEP-8 compliance.
Mod. When arguments are present in query string with no value default the value with DEFAULT_QUERY_VAL.
Add. 'refresh' to REQUEST_META_QUERY_STR
Mod. move cohort parsing methods into engine module.
Fix. PEP-8 compliance.
Add. Class to handle MediaWiki user ID generation from MediaWiki backend.
Rm. removed specialized time_series methods.
Mod. Moved specification of query type to initialization.
Fix. PEP-8 compliance/Use package level logger.
Add. method to format mediawiki timestamps.
Add. allow MediaWikiUsers object to be passed to time series jobs and pull all "valid" users in a time range by specifying the cohort "all"
Fix. indentation.
Fix. refresh regex. also store regex in module level attribute in api
Fix. Use OrderedDict to keep track of sorted results.  Reformat timestamp output.