Fixing grunt-bosonic

the current (0.5.0) version of grunt-bosonic *doesn't actually work* due to the 0.5.0 version of the bosonic transpiler *not actually transpiling templates and such into raw javascript* (it only works for React right now).

Making the generator use 0.4.0 means that `grunt demo` will actually work and build the files as expected. Versioning is important guys..

This fixes the issue I opened - #2