Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2381505 by dawehner, pwolanin, aspilicious, rteijeiro: Unserialize preloaded routes on the fly

Issue #2224777 by pwolanin, dawehner: Unlimited allowed length of path in menu router allows DoS attack on Drupal 8.

Issue #2051097 by dawehner, Manuel Garcia, tlattimore, neclimdul: Change 'pattern' to 'path' in *.routing.yml files.

Issue #1894002 by scor, msonnabaum, effulgentsia: Update vendor libraries and pin them to specific versions in composer.json.

Merge the Symfony and Drupal route compilers so that we only need to keep track of one.  The Drupal compiler now returns a compiled object that contains all of the Symfony information as well.

Larry Garfield authored Sep 12, 2012 and Alex Bronstein committed Oct 01, 2012

In order to make default placeholders work, we had to modify the fit and path outline
routines to ignore them.  That also necessitated switching back to the original
outline/ancestors logic from Drupal 7, which with a very slight tweak to the masks
and '/'-prefix on paths still works just as it should.

Larry Garfield authored Sep 02, 2012 and Alex Bronstein committed Oct 01, 2012

Port the regex path matching from Symfony to our CompiledRoute class so that we can match placeholder-using paths.

Larry Garfield authored Jun 23, 2012 and Alex Bronstein committed Oct 01, 2012

The PathMatcher matches against the database table structure generated by the
MatcherDumper.  As of this commit the lookup is not yet implemented. It's still
in testing.