Add parentheses to each `where` condition.
Merge branch 'refs/heads/my_master' into where_parentheses

Conflicts:
	spec/active_force/association_spec.rb
	spec/active_force/query_spec.rb
	spec/active_force/sobject/includes_spec.rb
Merge pull request #86 from llhupp/where_parentheses

Add parentheses to each `where` condition.