Issue #1827756 by das-peter: Fixed export functionality.
Issue #1993976 by jlapp: Fixed Breakpoints are not read from theme .info files when enabling themes in an installation profile.
Issue #1894998 by zoon_unit: Fixed No breakpoints are loaded for an Omega subtheme.
Issue #1894997 by zoon_unit: Fixed No breakpoints are loaded for an Omega subtheme.
only load breakpoints from enabled themes
remove unused variable
Issue #1872110 by amsri: Error on add responsive style page.
Provide a link to create breakpoints when a user wants to add a group before creating breakpoints
fix generated image style names
fixed undefined constant
update to breakpoints in core
revert custom groups defined by modules or themes
reload from module
work from jelle + comment cleanup
Make sure the multipliers are unique in the tests
fixed bugs in tests
Breakpoint group tests for theme- or module-defined breakpoint groups.
updated multiplier tests to new validation methods
cannot redeclare function
catch validation exceptions
breakpoint group name to id
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