Introduced the sharedspace plugin with inline editing support only.
Made the shared-space feature compatible with themed-ui.
Fixed coding style + switched strict mode on.
Fixed coding style in sharedspace sample.
Added shared spaces sample to the samples index.
Moved 'use strict' to the outer scope.
Removed plugins which are not compatible with shared-spaces.
Fixed the execution order of shared-space listeners to give proper time for other plugins to register their space fillers.
Scope 'use strict' statement

As well as extra space at the beginning of the file.
Merge branch 't/9387' into major