add distro representation
add service representation
start adding specs for services
add disk/partition representations & specs
add logical volume skeleton
add system representation
features to round out set

  - add new modules to main linux_admin module
  - add method to lookup local command from dictionary
tidy up new features, round out specs testing them
parse numeric partition sizes from parted output
add special distro types (generic/test)
Merge pull request #6 from movitto/master

Add representations of various system entities