project names with 'slash' break installApp task

Consider a project that contains a '/' in the name: (settings.gradle) rootProject.name = 'foo/bar'. The application plugin's task installApp breaks in runtime in such case.

Generally, I have a feeling the project name with a slash is not such a great idea and I'd expect a weird behavior in other plugins, too (e.g. ide plugins, etc.). Project name with a slash is also confusing because it resembles a path. At some point we might want to discuss what are the legal project names, etc.