Display cache builder workers as friendly strings

chef_server: http://localhost:4000
file_store: /Users/Justin/cookbooks
github: opscode-cookbooks
opscode
Capitalize first word of log messages

For consistency
Use #friendly_name instead of changing #to_s arity
Make CacheManager#to_s friendlier
Merge pull request #78 from justincampbell/friendlier-logging

Friendlier logging