working Project#get_popular_version method
pre-code review commit
Merge pull request #9 from petebrooks/project_show_controller

Project show controller
Merge pull request #10 from petebrooks/version-show

Version show
edits from code review
Merge pull request #11 from petebrooks/code_review

edits from code review
version model tests
resolve merge conflicts
ancestors/branch methods tested and refactored