Lots of enhancements to `murano init`.
Lots of enhancements to `murano init`.

- New --force option to install in directory with unknown files in it.
- New --purge option to syncdown after creating solutions (i.e., to overwrite existing project).
- Let user pass one arg to specify path to new project folder.
- If new project and no local files, pull down boilerplate project files.

tadpol/MuranoCLI,tadpol/MuranoCLI,exosite/MrMurano,tadpol/MuranoCLI,exosite/MrMurano