allow a, = x syntax. fixes #4610
fix append! and prepend! of self

thanks to @carlobaldassi
Don't introduce extra mmacosx-version-min for osxunwind
hvcat(Integer, as...) method for when all rows have the same number of block columns
Git.{dirty,staged,unstaged}: alternate, saner fix to #4349.

This is rapidly becoming my least favorite issue ever. This avoids
the diff.dothewrongthingbecauseitsslightlyfaster git option bug since
that atrocious option apparently only applied to "porcelain".
Use FC and FFLAGS to link openblas on 10.9.
Merge pull request #4614 from JuliaLang/kf/osx109

Make Julia work on 10.9
Pkg.success: use awful `git update-index --really-refresh` again.

This was horribly broken; apparently the fact that autorefreshindex
doesn't apply to plumbing commands means that they *default* to the
broken behavior. So now we use the plumbing commands and force the
index to be up-to-date by doing `git update-index --really-refresh`
before every Git.success command. Close #4349. Kill it with fire.

. I give up. This is a completely absurd
way to do this
`make test` now the same as `make testall`.

Also causes `make` in the `test` directory to test all by default.
Provide a build option USE_LLVM_SHLIB to help #2494
Doc updates.
Merge pull request #4637 from JuliaLang/vs/doc-matlab

Doc updates
Forgot to add the noteworthy-differences file in the earlier commit.
handle piping and redirecting into the repl. fixes #4537

also some code cleanup in the repl

adding Base.parse_input_line(IO) that incrementally parses multiline
input from an IO stream, a line at a time.
Merge branch 'master' of github.com:JuliaLang/julia
Git.success: pass `-q` flag to `update-index` so it won't error out.

Otherwise this command returns false if there are unstaged changes.
run `;cmd` through a shell
`;cd ~/dir` – shell expand `~/dir` for consistency.
`;cmd` – don't shell out on Windows where there are no real shells.
rename BLAS copy to blascopy!. closes #4633

also remove redundant and unsafe copy! definitions that were in blas.jl