Added support for Multisite#2

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parleer wants to merge 17 commits intofrc:masterfrom

Commits on Nov 6, 2014

added support for MU url formating
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Commits on Nov 7, 2014

adjust ['baseurl']
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Commits on Dec 5, 2014

added back compatibility for wp <3.9
parleer
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Commits on Dec 10, 2014

WP 3.2 compatibility
parleer
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Commits on Jan 10, 2015

fix for ssl in upload function
parleer
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Commits on Jan 16, 2015

fix virthost
parleer
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Commits on Feb 10, 2015

updated version to 1.1 and updated authorship
parleer
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Commits on Mar 9, 2015

fix gravityforms upload when running wpro as mu-plugin; handle post_image type fields
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Commits on Mar 11, 2015

fix name collissions for mixed case filename extensions-WP lowers extensions on upload
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Commits on Apr 7, 2015

Commits on May 12, 2016

add Cache-Control header to S3 and fix ssl urls to always use s3.amazonaws.com domain-style paths
parleer
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