fix(Router): handling of special chars in dynamic segments

[vicb]

• Please check if the PR fulfills these requirements
• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

fix

• What is the current behavior? (You can also link to an open issue here)

Special characters (ie "/") are not encoded for dynamic segments

• What is the new behavior (if this is a feature change)?

Special characters (ie "/") are encoded for dynamic segments

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

[btford]

LGTM

[vicb]

Travis is red due to SauceLabs flakiness (not related to this PR)

[mary-poppins]

Merging PR #7804 on behalf of @kara to branch presubmit-kara-pr-7804.

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