This adds the ability to specify the day of the week in formatting (parsing too, but it's not allowed to provide any additional information in date creation). In particular, this allows for the added const = RFC1123 date format used by HTTP.
Merge pull request #8125 from JuliaLang/jq/dates

Add day of week formatting ability
Add nowutc() function that is similar to now(), but returns the current system time in UTC. Also added tests and docs, as well as doc updates for the new day of week formatting.
Merge branch 'jq/dates'
update vagrant file
drop r-math lib
Fix type in dates conversions tests
tidy up complex division for half- and single-precision

ref #8121
doc: removed unused sidebar template
Merge branch 'master' of github.com:JuliaLang/julia
clarify doc for first() and last(). closes #2537
replace some uses of []. closes #8101

in particular, use a direct C_NULL pointer for unused lapack arguments.
updates suggested by @pao
Merge pull request #8123 from JuliaLang/jcb/fix8105

changes chooseproc behavior so that we start from master+1 pid
Merge pull request #8063 from ihnorton/pkgstatstr

Implement Pkg.status(::String)
changes to make codegen.cpp build with latest llvm 3.6
Merge pull request #8131 from jakebolewski/jcb/fixllvm36

changes to make codegen.cpp build with latest llvm 3.6
allow dlopen to handle library symbols
Merge pull request #8130 from jakebolewski/jcb/updatevagrant

update vagrant file
Merge pull request #8127 from JuliaLang/jcb/updatevagrant

update vagrant file