[DomCrawler] Fix relative path handling in links

Added relative path canonicalization according to RFC 3986, section 5.2.4
Merge branch '2.1' into 2.2

* 2.1:
  [FrameworkBundle] Fix code status in dockblock
  Fixed test to use Reflection
  [Finder] fixed a potential issue on Solaris where INF value is wrong (refs #7269)
  Update RouteCompiler.php
  [FrameworkBundle] avoids cache:clear to break if new/old folders already exist
  [HttpKernel] Fixed possible profiler token collision (closes #7272, closes #7171)
  [ClassLoader] tweaked test
  [ClassLoader] made DebugClassLoader idempotent
  [DomCrawler] Fix relative path handling in links

Conflicts:
	src/Symfony/Component/DomCrawler/Link.php
	src/Symfony/Component/Finder/Iterator/DepthRangeFilterIterator.php
	src/Symfony/Component/Routing/RouteCompiler.php