Added `offline` attribute to the `ContentStore` and added necessary basic implementations to sub classes (ceylon/ceylon-compiler#1121)
Implemented offline status for content stores based on `URLContentStore` (ceylon/ceylon-compiler#1121)
Fixed `getDisplayString()` for `URLContentStore` and sub classes (ceylon/ceylon-compiler#1121)
Added support for offline status to the `RepositoryManagerBuilder` and implementations (ceylon/ceylon-compiler#1121)
Added support for offline status to the `RepositoryBuilderImpl` (ceylon/ceylon-compiler#1121)
Added support for creating offline Maven repositories (ceylon/ceylon-compiler#1121)
Added support for setting offline status for Aether repositories (ceylon/ceylon-compiler#1121)
Added support for offline status (ceylon/ceylon-compiler#1121)
Added support for creating offline Aether repositories (ceylon/ceylon-compiler#1121)
Added support for creating offline `RepositoryManager` and `RepositoryManagerBuilder` objects (ceylon/ceylon-compiler#1121)
Minor fixes in tests due to API changes for the new offline mode (ceylon/ceylon-compiler#1121)