Merge pull request #2680 from andrioni/master

RFC: Add option to use a different handler on Base.test

c98962f8215466b84a9fc3a02e675ea87cf7f8e6@julia
Portuguese documentation should now work without the /en/latest

a2deb5d4aa0345a8e2dd74127c41a6bb18132f61@julia
Document ccall calling convention specifiers

88b67e9ed589aaf77041bc44e7fcc3be34c7a4fb@julia
Make special matrices part of matrix factorizations in the manual
Add Clang.jl in the calling C++ section

206db4de22edd5be50f05659bb061fbcd98091a9@julia