#113 Metrics download .csv extension incorrect

[elmugrat]

The extension of the downloaded metrics file "metrics.csv" is incorrect. .csv indicates a comma delineated file, but the metrics file is actually tab delimited. This causes Excel/OpenOffice.org Base and other spreadsheet apps to improperly parse the file.

Suggested fix:

Change extension on lines 68 and 69 of lib/Codestriker/Action/MetricsReport.pm from .csv to .tab.