fixed formatting of geo data

Geo tests failed for cultures using a comma as decimal point.
null check for if HttpContext.Current.User
Revert "null check for if HttpContext.Current.User"

This reverts commit a9523ceba5f807671916977b82a30e7eb4e8360f.
null check for if HttpContext.Current.User
encoded html entities in stacktraces
Merge pull request #4 from dkuppitz/formatprovider

fixed formatting of geo data
Merge remote-tracking branch 'upstream/master'
Removed `FormatStack` in favor of exception's `.ToString()`. Removed redundant `traceObject` null check.