Version bump to 1.1.0-alpha-1.
Complete rewrite of how the gallery shortcode is handled.  This introduces the Cleaner_Gallery class, which better separates a lot of the code that was all packed into a single function.

This change also brings in some new Schema.org microdata handling for various types of galleries.
Clean up gallery attributes and how the gallery is formatted and returned.
Add the 'gallery-columns-x' and 'gallery-size-x' classes to match core WP.
Fix where plugin's gallery stylesheet was loading despite the fact that themes built on Hybrid Core declared support for 'cleaner-gallery', which means the theme should be handling the styling.
Clean up plugin header.  Add 'Text Domain' and 'Domain Path' headers.
Integrate 'aria-describedby' for gallery images + captions.
Correct the mime type.
Header docs cleanup. Remove final ?> from file.
Theme support for Cleaner Gallery should be checked late.
Remove trailing ?> from files. Clean up copyright date.
Readme updates.
Update language files.
Version bump to 1.1.0.
Merge tag '1.1.0'

Tagging version 1.1.0.