rework of cluster manager. support additional launches via a worker
doc/faq/integers: link to Dan Luu's blog post on checked arithmetic

Also change the text of the final paragraph of this FAQ entry.
added isless() for IPAddrs - enables sorting and comparisons

made isless() a one-liner

make sure types are the same, and add some tests

more tests
Merge pull request #9399 from sbromberger/ipaddr-isless

added isless() for IPAddrs - enables sorting and comparisons
avoid the stack-smasher strcpy-alloca and minor cleanup
Revert "run win64 in parallel again on appveyor"

This reverts commit a297d5c816ef26274eb5e48e953eba1c3f2a8094.

Sadly issue #7942 is still a problem
Bump libgit2 to 0.21.3
Bump Windows PortableGit to 1.9.5

Bump git to 1.8.5.6 for Mac binaries

add checksums for git
Merge pull request #9309 from amitmurthy/amitm/cman_rework

rework of cluster manager. support additional launches via a worker
Fix typo in markdown BlockQuote rendering (fixes #9409)
patch libgit2 so 0.21.3 can compile with mingw
use kernel.org url for git

this tarball comes with configure so doesn't require autoconf
Merge pull request #9411 from JuliaLang/teh/blockquotes

Fix typo in markdown BlockQuote rendering (fixes #9409)