add pending to candidate search feature spec.

It was checking the count. As a feature test, should probably have an expectation on the resulting page instead.
rename candidate_searches_spec to candidate_searches_controller_spec
add tests for CandidatesController
add validations to Candidate
add specs for SupportMailer.deliver_new_candidate
add aws and configure paperclip to store in aws s3 for production
fix SupportMailer so that it loads fils from aws
fix paperclip defaults