set MARCH in msys_build.sh to be consistent with binaries
Make Period + CompoundPeriod communatative. Partially fixes #9214
Merge pull request #9215 from JuliaLang/jq/periods

Make Period + CompoundPeriod communatative. Partially fixes #9214
Fix -(::Period,::CompoundPeriod).
Merge branch 'master' of https://github.com/JuliaLang/julia
throw MethodError, not ArgumentError, for undefined Period/Time/Date operations
Merge pull request #9218 from stevengj/period_methoderror

throw MethodError, not ArgumentError, for undefined Period/Time/Date ops
Bump OpenLibm to 0.4.1.
Use openlibm on ARM.
juliatypes.jl: complete subtype algorithm

I believe there are now no more known-unhandled cases. There might be
bugs and it might be highly inefficient. The bookkeeping for the
search problem is quite tricky.
Merge branch 'master' of github.com:JuliaLang/julia