Tiled Gallery: Fix image meta encoding.

Image meta is now encoded by calling `esc_attr` on the result of mapping strval over the image meta attributes, instead of mapping `esc_attr`. This way `json_encode` can properly escape any quotes inside the attribute, before being attr encoded.
Remove leftover bit from previous Network CSS removal. Fixes Automattic/Jetpack#992
Merge pull request #647 from rase-/fix/image-meta-encoding

Tiled Gallery: Fix image meta encoding.
Merge pull request #993 from kraftbj/992

Remove leftover bit from previous Network CSS removal.
Open Graph: remove WordPress SEO from list of conflicting plugins

WordPress SEO now disables Jetpack OG Tags
See #Yoast/wordpress-seo#1374 and #929
In lieu of an actual jetpack, removing this line of whitespace should meet the requirements of most users. Fixes #1000
Add Facebook Open Graph Meta Tags for WordPress to Open Graph exclusion list
Jetpack General: Make sure that the settings link only appreas when you are allowed to visit setting
Adding back Pinterest sharing count
Merge pull request #1005 from kraftbj/pinterest-take2

Adding back Pinterest sharing count
Debugger: fix typo

Props @alicam
Contact Forms: Delete option to spam bulk actions

A bulk action option was added to the spam view to permanently delete multiple
posts at once.
Merge pull request #633 from rase-/add/bulk-delete

Contact Forms: Delete option to spam bulk actions