divider: responsive layouts are not properly supported

[clshortfuse]

Actual Behavior:

• What is the issue? * Divider will display as a column if the any responsive configuration of layout is set to row.
• What is the expected behavior?Divider should only display as a column if the current layout is in a row configuration.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: http://codepen.io/shortfuse/pen/rLdEyR
• Details: The problem is divider.scss is based around the layout-row-* only existing if it's displayed. The problem is the classes don't disappear when layout changes, locking divider into act as if it's always in a row configuration

Angular Versions: *

• Angular Version: 1.1.0-rc5 (master)
• Angular Material Version: 1.5.5

Additional Information:

• Browser Type: * Chrome
• Browser Version: * v52
• OS: *ChromeOS

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[clshortfuse]

Reopening because commit that closed the issue was reverted.