Twenty Fifteen: correcting odd scrolling and jumping in IE and no-scroll with window resize.

Props iamtakashi, ocean90, fixes #30632, #30645.



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Twenty Fifteen: Removing the empty changelog.txt.

Fixes #30650.


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git-svn-id: http://core.svn.wordpress.org/trunk@30799 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: using an opaque share icon as the default instead of semi-opaque "no" icon that suggests a bug.

Props iamtakashi, fixes #30148.


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git-svn-id: http://core.svn.wordpress.org/trunk@30800 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: updating the .pot to reflect changes in r30790.

Props iamtakashi, fixes #30603.


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TinyMCE, image toolbar: remove the animation and make the box-shadow lighter. Props melchoyce, fixes #30664.
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