Fixing sales tax bug Bill A reported.
Backed out changeset 1d863d07841a
Adding PSGI.pm
Starman with unified plack abstraction basically works.  For some reason user settings not retrieved properly.
Updated changelog
Merge pull request #418 from einhverfr/1.3

Plack support now works
Merge pull request #37 from ledgersmb/1.3

1.3 - sync from central