Extend association module.
Generate WHERE/IN clause with arrays passed as hash values to SObject.where()
Merge pull request #64 from DanOlson/where-in

Generate WHERE/IN clause with arrays passed as hash values to SObject.wh...
Add basic SObject.includes() functionality. Only formulates relationship query to SFDC API.

Conflicts:

	lib/active_force/sobject.rb
Rename reflection for association.
Merge pull request #65 from ionia-corporation/association_refactor_dan

Add eager load association for belongs_to association with `includes`
Make clear credentials setup in the readme.
Add query basics to README.
Add includes to the changelog.