Phusion Passenger 4.0 RC 6 released

[Hongli Lai]

We are pleased to announce Phusion Passenger 4.0 Release Candidate 6.
Please read http://blog.phusion.nl/2013/04/09/phusion-passenger-4-0-release-candidate-6/
for more information.

Summary of changes in this release:
* The default config snippet for Apache has changed! It must now contain a
`PassengerDefaultRuby` option. The installer has been updated to output
this option. The `PassengerRuby` option still exists, but it's only used
for configuring different Ruby interpreters in different contexts. Please
refer to the manual for more information.
* We now provide GPG digital signatures for all file releases by Phusion.
More information can be found in the manual.
* WebSocket support on Nginx. Requires Nginx >= 1.3.15.
* `passenger-status` now displays process memory usage and time when it
was last used. The latter fixes issue #853.
* Exceptions in Rack application objects are now caught to prevent
application processes from exiting.
* The `passenger-config` tool now supports the `--ruby-command` argument,
which helps the user with figuring out the correct Ruby command to use
in case s/he wants to use multiple Ruby interpreters. The manual has
also been updated to mention this tool.
* Fixed streaming responses on Apache.
* Worked around an OS X Unix domain socket bug. Fixes issue #854.
* Out-of-Band Garbage Collection now works properly when the application
has disabled garbage collection. Fixes issue #859.
* Fixed support for /usr/bin/python on OS X. Fixes issue #855.
* Fixed looping-without-sleeping in the ApplicationPool garbage collector
if PassengerPoolIdleTime is set to 0. Fixes issue #858.
* Fixed some process memory usage measurement bugs.
* Fixed process memory usage measurement on NetBSD. Fixes issue #736.
* Fixed a file descriptor leak in the Out-of-Band Work feature. Fixes
issue #864.
* The PassengerPreStart helper script now uses the default Ruby
interpreter specified in the web server configuration, and no longer
requires a `ruby` command to be in `$PATH`.
* Updated preferred PCRE version to 8.32.
* Worked around some RVM bugs.
* The ngx_http_stub_status_module is now enabled by default.
* Performance optimizations.

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