Support for Microsoft Excel output using xlwt.
Merge pull request #2 from dmpayton/master

XLS Output
utf8 encoding for xls output
Merge pull request #3 from dmpayton/master

utf8 encoding for xls output
rewrite of async reports
Merge branch 'master' into async

Conflicts:
	reportengine/base.py
fixed pagination
fix aggregates
handle task failure
added task and command to remove stale reports
dont require celery
generated reports now have their own url
user is now greated with a form before processing the report
template fixes
exporting to other formats is now task based
more usability enhancemants
quick export for small reports
breadcumb fix
preserve ordering of start and end time filter controls
prepare for pypi packaging