Use raw troff encoding for official HHVM man page

Summary: So we don't have to require `ronn` to build the man page, just use the raw troff
format instead. That way it can be put into `/usr/share/man/man1` directly and just
work.

Reviewed By: @ptarjan

Differential Revision: D1536269
facebook::proxygen --> ::proxygen

Summary: See discussion here: https://www.facebook.com/groups/opensourceatfb/permalink/771563229554092/
After I get fbcode contbuild clean, I'll submit a diff for
hhvm-third-party. In the meantime, the cmake build will fail here.

Reviewed By: @ptarjan

Differential Revision: D1537217
Ignore __pycache__ left behind from python 3 embedded in gdb.

Summary: Closes https://github.com/facebook/hhvm/pull/3673

Reviewed By: @fredemmott

Differential Revision: D1539920

Pulled By: @JoelMarcey
Updated mockery to 0.9.2

Summary: There is one issue here:

```
1) Mockery\Generator\MockConfigurationBuilderTest::reservedWordsAreBlackListedByDefault

RUN TEST FILE:  cd /root/hhvm/hphp/test/frameworks/framework_downloads/mockery && /root/hhvm/hphp/test/frameworks/../../hhvm/hhvm -v Repo.Local.Mode=-- -v Repo.Central.Path=/tmp/framework-testgHoUxi --config /root/hhvm/hphp/test/frameworks/php.ini -c /root/hhvm/hphp/test/frameworks/framework_class_overrides/Mockery.ini /root/hhvm/hphp/test/frameworks/framework_class_overrides/../vendor/bin/phpunit --debug  -c /root/hhvm/hphp/test/frameworks/framework_downloads/mockery/phpunit.xml.dist --filter 'Mockery\\Generator\\MockConfigurationBuilderTest::reservedWordsAreBlackListedByDefault'

Need a builtin class with a method that is a reserved word

/root/hhvm/hphp/test/frameworks/framework_downloads/mockery/tests/Mockery/Test/Generator/MockConfigurationBuilderTest.php:19
/root/hhvm/hphp/test/frameworks/vendor/phpunit/phpunit/src/TextUI/Command.php:186
/root/hhvm/hphp/test/frameworks/vendor
Closes https://github.com/facebook/hhvm/pull/3676

Reviewed By: @fredemmott, @JoelMarcey

Differential Revision: D1539922
Ban running oss perf as root

Summary: unneccessary; while it can't directly cause problems, it can make things harder to debug - eg instead of getting a permission error, a required log file silently goes to the wrong place.

Reviewed By: @JoelMarcey

Differential Revision: D1540031
Add --php options to HHVM man page

Summary: Have a separate section with the options we support when emulating PHP 5.x with the `--php` flag.

Reviewed By: @ptarjan

Differential Revision: D1540586
Fix case for parent classes in autoload

Summary: The case of the name passed to autoload should match
the case in the extends/implements/use clause, not the
case of the class/interface/trait declaration.

Closes #3146

Reviewed By: @jdelong

Differential Revision: D1540544
Turn off ControlFlow by default in WholeProgram mode

Summary: Its no longer doing anything useful, and its 85% of the
postoptimize time. I'll turn it off first, and if no issues turn
up, I'll get rid of the code.

Reviewed By: @jdelong

Differential Revision: D1540059
Fix refcounting in arReturn() and stop leaking static strings.

Summary: Change arReturn() to take Variant&& and move the value
to the return slot in ActRec.

Reviewed By: @markw65

Differential Revision: D1541349
Fix GMP tests/crashes

Summary: This should fix some crashes and all bad tests other than 014, and 028.

I marked test 014 as flakey, as it is checking for wrong return values due to a bug in PHP.  It appears as though PHP is using the resource number as the factorial rather than the resource's value, giving unpridictable results (depends on how many resources have been used thus far)

Test 028 still fails as gmp_random is not implemented.
Closes https://github.com/facebook/hhvm/pull/3639

Reviewed By: @sgolemon

Differential Revision: D1530781
Include files in zend/bad/zip/

Summary: This was included in zend/good, but the importer didn't know of this.
Unfortunately it didn't fix a test
Closes https://github.com/facebook/hhvm/pull/3684

Reviewed By: @sgolemon

Differential Revision: D1541445
Fix undefined variable in Imagick::valid

Summary: Fixes #3682
Closes https://github.com/facebook/hhvm/pull/3683

Reviewed By: @sgolemon

Differential Revision: D1541444
Make optimizedCallCount load a cell

Summary: Count takes a cell as its first source, we shouldn't pass it a Gen.

Reviewed By: @alexmalyshev

Differential Revision: D1540955
docskel: Update URL

Summary: PHP has now moved to using git, and the svn url now points to their
SVN extension library...

Reviewed By: @ptarjan

Differential Revision: D1541790
Slight cleanup on jit::Edge, add from() method.

Summary: Tired of doing edge->inst()->block() every time.

Reviewed By: @edwinsmith

Differential Revision: D1537879
typechecker: clearer error messages for __TRAIT__ misuse

Reviewed By: @elgenie

Differential Revision: D1533111
Implement posix_errno

Summary: Closes https://github.com/facebook/hhvm/pull/3685

Reviewed By: @sgolemon

Differential Revision: D1541447
Add options parameter to DOMDocument::load/loadHTML()

Summary: Fixes #3695
Closes https://github.com/facebook/hhvm/pull/3696

Reviewed By: @sgolemon

Differential Revision: D1541940
Xdebug remote debugging compatibility and bug fixes

Summary: This diff finishes the last two remote debugging commmands property_get and property_set, fixes remote debugging bugs, and adds compatibility fixes to ensure remote debugging fully works with phpstorm, komodo, netbeans, and vim.

Additions:
* Implemented property_set and property_value and added test for property_set
* Updated tests broken with the below changes
* General cleanup

Compatibility:
* Added $GLOBALS variable to superglobal context
* Filtered out superglobals from the local context
* Context ids should start at 0 for komodo to be happy
* Replaced calls to `xdebug_get_php_symbol` with an eval. There were bugs with `xdebug_get_php_symbol` and I discovered phpstorm, komodo, netbeans, and the vim plugin always just send an expression.
* stack_get was being used by ides differently than expected. E.g. level 0 is intended to be the current location

Bug Fixes:
* xdebug.idekey ini setting was incorrectly named xdebug.ide_key
* When outputting arrays to xml the page was always set to 0
*
Closes https://github.com/facebook/hhvm/pull/3670

Reviewed By: @paulbiss

Differential Revision: D1539060

Pulled By: @sgolemon
Ensure that the entry block of an IRUnit does not have predecessors.

Summary: This can happen if the first block in the region is a loop header.

Reviewed By: @ottoni

Differential Revision: D1537458