Attempt to fix new R CMD check warning _R_CHECK_XREFS_MIND_SUSPECT_ANCHORS_.

Run all builds

These tests must also be updated

Update visual tests for in R-devel.

Check for infinite values in the response/predictor route. Fixes issue #78.

Looks like this test will really never be reliably silent. Broken again with Rcpp 1.0.4.6.