Try to fix signbit & isfinite again
Merge pull request #513 from jaredhoberock/complex-issue

Try to fix signbit & isfinite again
Ignore unknown variables since the way we were handling it broke the
tests=regex option

Allow additional architecture options for the arch command line variable
Set the default architecture to sm_20

Fixes #509
Merge pull request #514 from jaredhoberock/issue-509

Ignore unknown variables since the way we were handling it broke the