picture 7.x-2.2

Changes since 7.x-2.1 (21 commits):

• #2139459 by Devin Carlson | guruslot: Add $tips translation.
• #2173015 by Devin Carlson: Move hook_uninstall() to picture.install.
• #2072687 by bkonetzny: Fixed Missing image breaks all later images.
• #2059471 by clemens.tolboom: Fixed Message 'Picture group doesn't exists' is incorrect.
• Fixed comment
• #2172831 by Devin Carlson: Remove implementation of hook_ctools_plugin_api().
• #2280289 by Sutharsan: Fixed Missing argument 1 for PictureMapping::export().
• #2279995 by hctom: Added Clean up export.
• #2266837 by echoz: Fixed image name with space, not wrapped in span.
• #2024369 by R2-D8 | barber75: Fixed WYSIWYG (with CKeditor) not injecting adaptive images.
• #2270403 by espurnes: Video in colorbox: incorrect size with picturefill, use weblinc.
• #2028525 by das-peter: Fixed Flexslider integration doesn't properly use in-code-only settings.
• #2173043 by Devin Carlson: Add ctools as a dependency.
• Code style
• #2084979 by das-peter, indigoxela, arrrgh, jantoine | impleri: Fixed flexslider_picture broken on/after flexslider -alpha3.
• #2274661 by jstoller: Fixed Fatal error: Argument 1 passed to picture_get_mapping_breakpoints() must be an instance of PictureMapping.
• Update to Picturefill 2.1.0-Beta
• Only show colorbox select when needed
• code style