Fixed JSON error with manifest.webapp

Signed-off-by: Levente Kurusa <levex@linux.com>
Add index.html

Application can now be run.

Signed-off-by: Levente Kurusa <levex@linux.com>
Add Gaia Building Blocks as a submodule.

Signed-off-by: Levente Kurusa <levex@linux.com>