Shut down all named pipes and tcp streams in jl_close_uv.
Add a test for shutdown being called twice.  Unfortunately it hangs rather than fails.
Stop using libuv's flags, check in jl_close_uv if close has already been called from julia
Change is_open to isopen
Test handle type before testing writable
If a shutdownable stream is not writable, don't call uv_close on it.
fix rst markup in doc/manual/types.rst

In rst markup, inline literals (i.e. code samples)
can't be nested inside strong emphasis (bold).
The backticks were showing in the rendered output.
document cglobal (from issue #1815), and fix deprecated unsafe_ref/assign -> unsafe_load/store! in the manual
Merge pull request #3092 from waldir/patch-1

fix rst markup in doc/manual/types.rst
Minor tweaks to doc/manual/variables-and-scoping.rst
A few small adjustments in the manual
Merge pull request #3093 from waldir/docfixes

several minor tweaks to the manual
Get jl_uv_close working again by checking uv_is_closing at the top and closing when a handle isn't writable or closing
Use JULIA_CB to cache isopen
make sure dimensions match in complex(). fixes #3090
Merge pull request #3084 from rsofaer/uv_shutdown_in_julia_close

RFC: uv_shutdown in julia close