chef: extract domain_name, secondary_app_name

Improve comments
ey: add lz_custom_configuration 

This is prep for other config entries.

Cleaned up lz_ey_unicorn
Moved Unicorn entry in env.custom to lz_custom_config
Unicorn recipe ensures custom config creates Unicorn entry.
Remove ruby_block override.
ey: increase deploy timeout.
Convert .rmrc to .ruby-version