Ref #2 Implement BuildResult class

Update Rspec config to force expect syntax

Update gemspec with guard dependencies

Initial empty build_result spec

BuildResult#status spec finished

Ref #2: Create build_result class
Ref #2: Remove build_result from StashNotifier class
Add Guardfile
Setup for testing with VCR
ref di-2: Add VCR support for successful request test
Ref di-2: All specs pass
Add tests and refactor StashNotifier
Merge pull request #7 from Nordstrom/di-2

di-2: Add tests and refactor StashNotifier