Force OpenBLAS to have a more sane GEMM_MULTITHREAD_THRESHOLD
Added StackOverflow link on README.md

I think StackOverflow is a very good platform, and helps expose Julia to a broader public. Putting a link here on the README should direct users to post more questions there.

Now, Julia is not very present at StackOverflow, and users might have the wrong impression that nobody uses the language or care about it. After all, the julia-users list is full of questions and nice answers.
support many more Unicode infix operators
Added "external resources" section, with links
Add docs for short forms of reduce and fold
eliminate a couple more confusables; multiset multiplication U+228D should have * precedence despite looking like a union; change NEWS table to only explicitly list operators that are predefined
Check for definiteness in generalised eigensolvers. Use I in eigs. Change default nev in eigs because different restrictions apply to symmetric and non-symmetric problems. Use factorize instead of lufact for inverse operations.
fix #6977, trying to allocate arrayvar for Array{None}
Merge pull request #6932 from brk00/patch-1

Added StackOverflow link on README.md
fix #6966
Merge pull request #6942 from binarybana/master

Add docs for short forms of reduce and fold
rm U+2a01 (N-ary circled plus) from infix list
make Filter iterator composable by calling done and next once per item

fixes #6943
Merge branch 'master' of https://github.com/JuliaLang/julia
Merge pull request #6923 from JuliaLang/sf/gemmthresh

[WIP] Force OpenBLAS to have a more sane GEMM_MULTITHREAD_THRESHOLD
Merge pull request #6964 from JuliaLang/anj/geneig

Check for definiteness in generalised eigensolvers.
Improved foldl implementation, which now adopts the type stable procedure and is specialized on common operations.
improve type stability of foldr
use hash tables more for token predicates in parser
Merge pull request #6929 from stevengj/uni_ops

support many more Unicode infix operators