stat: don't fail on stat("foo/bar") when "foo" is not a directory.

Also, allow calling stat-related functions with varargs by doing a
joinpath on the pieces and then stat:ing that path.
produce(x,y): with multiple args, produce the tuple of arguments.
wip: full re-write of Pkg functionality.
Adds mineig and maxeig methods

Find smallest and largest eigenvalues for real eigenvalues

Includes specialized method fo SymTridiagonal.
Some fixes to Triangular and Hermitian matrices. Define right matrix division for AbstractMatrix instead of StridedMatrix. Add BLAS triangular solver and corresponding methods for Triangular.
Add USE_SYSTEM_GRISU=0 to Make.inc
Allow At_mul_B and A_mul_Bt to work with Vectors
Merge pull request #2726 from JuliaLang/anj/fixlinalg

Some fixes to Triangular and Hermitian matrices.
Merge branch 'master' of github.com:JuliaLang/julia
listen: increase the default backlog to match the Node.js default.
reinterpret: scalar reinterpret for Float{32,64} => Uint{32,64}.
Renames to eigmax and eigmin
close #2719
Merge pull request #2725 from jiahao/maxeig

Adds mineig and maxeig methods
Merge remote-tracking branch 'upstream/master' into kd/farm