* weaverryan/prevent_exception_on_handle_exception:
[HttpKernel] Wrapping the end of handleException() in a try-catch to prevent response listeners from throwing another exception
* weaverryan/better_import_exception_and_bug_fix:
[Config] Improving the exception when a resource cannot be imported
[DependencyInjection] Fixing a bug where "ignore_errors" doesn't work in YAML and XML
* weaverryan/exception_page_changes:
[FrameworkBundle] When there are multiple nested exceptions, this hides the stacktrace from all exceptions by default
[FrameworkBundle] Fixing small bug on exception page where the +/- icons didn't toggle correctly
* kriswallsmith/assetic/updates:
[AsseticBundle] added twig support for asset packages
[AsseticBundle] cleaned up php templating support
[FrameworkBundle] fixed interface and usage in RouterHelper
[AsseticBundle] fixed twig classes for api changes in assetic
* kriswallsmith/assetic/config-fixes:
[AsseticBundle] moved some parameter defaults to Configuration
[AsseticBundle] fixed definition of filter configs
This addresses the potential issue where a user doesn't realize that there are multiple exception messages because the
full stack trace of the first exception is displayed (pushing the others far far down the page). This hides the stacktrace
of all exceptions (when there are more than one) by default, making each exception message easily viewable.
This improves, for example, the exception one would receive if they tried to import a resource from a bundle that doesn't exist.
Previously, the deep "bundle is not activated" exception would be thrown. That has value, however there is no indication of where
the exception is actually occurring.
In this new implementation, we throw an exception that explains exactly which resource, and from which source resource, cannot be
loaded. The deeper exception is still thrown as a nested exception.
Two caveats:
* The `HttpKernel::varToString` method was replicated
* This introduces a new `Exception` class, which allows us to prevent lot's of exceptions from nesting into each other in the case
that some deeply imported resource cannot be imported (each upstream import that fails doesn't add its own exception).
* hason/frameworkbundle:
[HttpKernel] removed unused class
[FrameworkBundle] fixed bugs
[FrameworkBundle] fixed test on windows
[FrameworkBundle] fixed CS
