Add .arcconfig

Summary: Adding new file
Test Plan: Well running arc diff after this is the test
Reviewed By: davidrecordon
Reviewers: epriestley, davidrecordon
CC: aran, davidrecordon
Differential Revision: 681
Fixed PHP 5.4 building

Summary:
Fixed PHP 5.4 building
* class names became constants
* return_reference is stored in zend_function.fn_flags
* deal with znode reorganisation

Test Plan:
Build against php 5.4
Build against php 5.3

Reviewers: scoates

CC:

Differential Revision: 682
list existing runs sorted by filemtime desc
Added scalable vector graphic support. Added the SVG content-type and ID
to the list of supported image formats. This is related to the 'dot'
graph generator.
Merge pull request #4 from webdevel/master

Added the SVG content-type and ID to the list of supported image formats
Whitespace cleanup and fix some compiler warnings
Proxy zend_compile_string() so that eval() compilation time is included in profiling data
Merge pull request #2 from salimane/master

list existing runs sorted by filemtime desc
Merge pull request #5 from davidsklar/master

Proxy zend_compile_string() so that eval() compilation tme is profiled
composer.json added, see getcomposer.org for details
Merge pull request #8 from timheil/master

add composer.json (see getcomposer.org / packagist.org)
Update xhprof_html/docs/index.html

Fixed couple typos
Merge pull request #11 from joedevon/patch-1

Update xhprof_html/docs/index.html
French translation of documentation
Merge remote-tracking branch 'upstream/master'
Merge pull request #12 from webaaz/master

French translation of documentation

reviewed by: Mathieu Rochelle
Fix Bug #62062 (PECL) - Reset the zend_compile_string function on stop
Merge pull request #13 from Danez/master

Fix Bug #62062 (PECL) - Reset the zend_compile_string function on stop
Optimised images
fix for PHP 5.5