Fix margin-bottom on dropdown (navbar-fixed-bottom).
Fixes #14990: Media bodies take up full width

Signed-off-by: Beatrice Peng <bpeng@pivotal.io>
Merge pull request #15307 from vsn4ik/part_of_15148

Fix part of #15148.
Merge pull request #15391 from stubbornella/master

Fixes #14990: Media bodies take up full width
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http://crbug.com/438064 has been fixed

Refs #14972

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Merge pull request #15424 from twbs/chrome-438064-fixed

Remove #14972's entry from Wall of Browser bugs
Remove holder.js references from syntax-highlighted example HTML

Our use of Holder.js in the docs is a mere implementation detail.
Don't want to confuse people into thinking Holder.js
is somehow required by the Thumbnail component.

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Remove reference to old fixed WebKit bug in Less comment.

Per https://github.com/twbs/bootstrap/issues/1969#issuecomment-36971094

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Merge pull request #15427 from twbs/defunct-bug-1969

Remove reference to old fixed WebKit bug in Less comment.
Reference iOS Safari temporal input bug in explanatory Less comment

Refs #11266, #13098, #15415

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add more refs to browser-related bugs in Less comments
IE11 & current Firefox are still affected.

Refs #11623
Add summary of #11526 to explanatory Less comment

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Merge pull request #15426 from twbs/hide-holder

Remove holder.js references from syntax-highlighted example HTML
Merge pull request #15428 from twbs/browser-bugs

add/update/summarize browser bug refs in Less comments
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