Merge styles of parent
Merge with master
Merge branch 'master' into fi/nested_styles
TextBlock initialize method expects a String array
Merge conflict with master fixed
Merge branch 'master' into fi/nested_styles
Margins implementation on dimensions
Remove margin from ALL THE THINGS
fix for return value of margin
Toggle/show/hide support for TextBlock
Toggle specs for all shape elements, fix for Shoes::Swt::Arc#toggle
Support toggle on Shoes::Swt::Button and Shoes::Swt::CheckButton
Support toggle on Shoes::Swt::Background
Use @real when toggling

Don't need to go all the way back to the @dsl.gui.real object. We're already
in the context of the @dsl.gui.
Spec toggle for Shoes::Swt::Image

Modified Shoes::Swt::Common::Toggle to allow @real to not support set_visible
as the SWT element for images don't have it. Toggling was already provided on
that class, though, in the underlying paint listener.
Support toggle on Shoes::Swt::EditBox
Support toggle on Shoes::Swt::EditLine
Support toggle on Shoes::Swt::ListBox
Support toggle on Shoes::Swt::Progress
Spec support for toggle on Shoes::Swt::Radio