Make the path to the subscription adapters configurable. Merge subscription_map into item_types
Remove some comments
Eliminate hardcoding of search_types and cite_types. Reduce reliance on subscriptions.yml in environment.rb
Eliminate need for subscriptions.yml
Eliminate hardcoding of which adapters are syncable
Merge pull request #481 from jpmckinney/reuse

Give adapters control over their destiny
Fix SCOUT_ADAPTER_PATH typo