Rename known-mean variants to stdm and varm.
Drop "corrected" flag.
Adding dim/region versions of mean, var, and std.
Test and doc updates for stdm/varm.
Merge pull request #2561 from blakejohnson/stats-dim-args

varm/stdm and stats dimension arguments (closes #2265)
examples/modint.jl: make the ModInt type immutable.
Pkg: make Pkg.Resolve interface purely functional.

This is a first step towards refactoring Pkg in such a way that it
can actually be tested. Since this is now purely functional, it can
be tested without needing to have git repos or any other Pkg stuff.
closes #2566
fix #2568, rename Y()
fix #2562
fix problem where make exits with 0 when running 1 failing test
add module keywords to doc index. closes #2072
add punctuation table to doc. closes #1524
document more constants
help("@macro") works; describe it. closes #1461
Move cpp.jl into a package
Remove cpp documentation (use package docs)
Merge branch 'master' of git://github.com/JuliaLang/julia