detect plugin version
revise internals for loading plugins
create/update spec tests
fix error/exception handling for loading plugins
add plugin loading to common spec
readable plugin strings in unit/plugins/fail_spec.rb
add v6 deprecation warning to load phase
add debug message for already loaded plugins
move v6_dependency_solver management to system
remove pry debugging tools
Merge pull request #172 from opscode/OHAI-9360

Detect plugin version