[2.3] [DomCrawler] adds schema relative URL support to link
merged branch jfsimon/issue-7169 (PR #7179)

This PR was squashed before being merged into the master branch (closes #7179).

Commits
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c6fe27f [2.3] [DomCrawler] adds schema relative URL support to link

Discussion
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[2.3] [DomCrawler] adds schema relative URL support to link

Adds support for `//relative/schema` URLs to `DomCrawler` links.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7169

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by stof at 2013-02-25T19:17:10Z

:+1: