Print a more useful error message if any PHPUnit tests crash

Summary:
Before, if PHPUnit crashed (syntax error, undefined constant, etc), you would get a relatively unhelpful error message:

    firehed@Eric-Sterns-Mac-Pro ~/dev/php-lcd: arc unit
    Exception
    Clover coverage XML report file is empty, it probably means that phpunit failed to run tests. Try running arc unit with --trace option and then run generated phpunit command yourself, you might get the answer.
    (Run with --trace for a full exception trace.)

This now checks the json and code coverage reports and tries to pull a useful error message:

  firehed@Eric-Sterns-Mac-Pro ~/dev/php-lcd: arc unit
  Exception
  The test '/Users/firehed/dev/php-lcd/tests/PlateButtonsTest.php' crashed with the following output:

  Fatal error: Undefined class constant 'EFT' in /Users/firehed/dev/php-lcd/tests/PlateButtonsTest.php on line 25

  Call Stack:
  	0.0002     233104   1. {main}() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/composer/bin/phpunit:0
  	0.0039     564872   2. PHPUnit_TextUI_Command::main() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/composer/bin/phpunit:63
  	0.0039     565496   3. PHPUnit_TextUI_Command->run() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:129
  	0.0247    2280168   4. PHPUnit_TextUI_TestRunner->doRun() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php:176
  	0.0293    2730760   5. PHPUnit_Framework_TestSuite->run() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/TextUI/TestRunner.php:349
  	0.1211    3996832   6. PHPUnit_Framework_TestSuite->runTest() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:745
  	0.1211    3996832   7. PHPUnit_Framework_TestCase->run() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php:775
  	0.1211    3996832   8. PHPUnit_Framework_TestResult->run() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:783
  	0.1233    3999752   9. PHPUnit_Framework_TestCase->runBare() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestResult.php:648
  	0.1236    4016432  10. PHPUnit_Framework_TestCase->runTest() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:838
  	0.1237    4017240  11. ReflectionMethod->invokeArgs() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:983
  	0.1237    4017520  12. Firehed\PlateButtonsTest->testSingleButtonOnButtonDown() /Users/firehed/dev/php-lcd/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php:983

  (Run with --trace for a full exception trace.)

Or if nothing was written to `stderr`, you may get something like this:

  firehed@Eric-Sterns-Mac-Pro ~/dev/php-lcd: arc unit --no-coverage
  Exception
  Test Firehed\PlateButtonsTest::testSingleButtonOnButtonDown did not finish
  (Run with --trace for a full exception trace.)

Test Plan:
`arc unit` for arcanist itself
`arc unit` before and after the change on a project where:
* all tests pass
* some tests are failing
* a test causes a fatal error (undefined constant, bad method call, etc)
* a test file is invalid (syntax error)

No regressions that I could find, and all crashes now display a more useful error.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: epriestley

CC: aurelijus, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7848
Show current config and source using arc set-config --show

Summary:
`arc set-config --show` only show the user config
It would be better to contain local/global/system config

Test Plan: set config by local/global/system/user/project, and check the result of `arc set-config --show`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: epriestley

CC: epriestley, aran

Differential Revision: https://secure.phabricator.com/D7851
Recognize `ZipArchive` as an extension class

Summary: See D7879 for an example. This is an extension class.

Test Plan: You do it bwahaha

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7880
In Subversion, treat missing files similarly to conflicted files

Summary: See <https://github.com/facebook/arcanist/issues/133>. Treat "!" files like "C" and "?" files and make the user deal with them.

Test Plan:
  >>> orbital ~/repos/INIS $ svn st
  !       README
  >>> orbital ~/repos/INIS $ arc diff
  Usage Exception: You have missing files in this working copy. Revert or formally remove them (with `svn rm`) before proceeding.

    Working copy: /INSECURE/repos/INIS/

    Missing files in working copy:
      README

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7886
Allow tests to be executed in the root library directory

See: <https://github.com/facebook/arcanist/pull/135>

Reviewed by: epriestley
Merge remote-tracking branch 'upstream/master'