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

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




git-svn-id: https://develop.svn.wordpress.org/trunk@30808 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: Removing the empty changelog.txt.

Fixes #30650.



git-svn-id: https://develop.svn.wordpress.org/trunk@30809 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: using an opaque share icon as the default instead of semi-opaque "no" icon that suggests a bug.

Props iamtakashi, fixes #30148.



git-svn-id: https://develop.svn.wordpress.org/trunk@30810 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fifteen: updating the .pot to reflect changes in r30790.

Props iamtakashi, fixes #30603.



git-svn-id: https://develop.svn.wordpress.org/trunk@30811 602fd350-edb4-49c9-b593-d223f7449a82
TinyMCE, image toolbar: remove the animation and make the box-shadow lighter. Props melchoyce, fixes #30664.

git-svn-id: https://develop.svn.wordpress.org/trunk@30812 602fd350-edb4-49c9-b593-d223f7449a82