Fix #6372

This adds the package to REQUIRE on Pkg.clone() if it exists in
METADATA. This means that calling Pkg.clone() on a repo that's on an
old tag will result in the package getting updated to the latest
release, but that seemed preferable to making Pkg.clone() on a package
that's on a tag result in a pinned package.
Added capability to process splatted arguments and moved the check
of argument number compatibiilty from macro expansion time to runtime.
Modified to differentiate situations when splatting does and does not
occur and checks argument cardinality at macro expansion time if not.
Further optimized based on lack of splatting
Implement grisu algorithm in native Julia.
Merge branch 'master' of https://github.com/JuliaLang/julia into jq/grisu
Export the grisu method to allow importing by Printf module. Should fix travis failure.
Merge branch 'master' of https://github.com/JuliaLang/julia into jq/grisu
realmax(Float16) now prints '65500.0' instead of '65504.0' in accordance with the grisu alogrithm (printing the shortest form that can be read back in accurately).
1st attempt at removing all double-conversion library traces.
Add double-conversion LICENSE to grisu folder. Tweak .gitignore
Merge branch 'master' of https://github.com/JuliaLang/julia into jq/grisu
Merge branch 'master' of https://github.com/JuliaLang/julia into jq/grisu

Conflicts:
	deps/Makefile
Merge branch 'master' of https://github.com/JuliaLang/julia into jq/grisu
add jl_get_cpu_name function to libjulia

thin ccall'able wrapper around llvm::sys::getHostCPUName
Modify jl_get_cpu_name to use jl_pchar_to_string,

add Sys.cpu_name
Move cpu_name into init_sysinfo()
Evaluate and print parts of comparisons in `@test`.
Adds a resultexpr field to Failure and Success.
Add Dates module to Base
Add back llvmcall