added built-in exception UndefVarError to manual
Merge pull request #8386 from davidssmith/man

added built-in exception UndefVarError to manual
close #8304, tweak openblas build troubleshooting

this is a bit redundant, but it definitely belongs under the category of openblas build failure
Bump libosxunwind to 0.0.1. (RC3 was marked as release).
Stylistic change

See https://github.com/JuliaLang/julia/pull/8323#discussion_r17609618
Merge branch 'upstream-master'