add Vm#safe_name for file paths and hostname
fix #18 create file logs per command
make job install-katello configurable

it can install last release or latest katello
change job logger name to avoid confusion
fix #17 store backaged rpms to support/builds

create Koji tasks ahead then wait for all of them to finish
continue when hostname setting fails
update gitignore to exclude builds and logs
add build base command to create base development machine easily

- takes vm with clean system
- does a clone
- installs katello development machine on it
show help for all commands when `kvizer` or `kvizer --help` is run