Extract view_context setup for specs to 'view_context_spec_helper.rb'
Fix bug with zeus and requires

* Details on Stackoverflow:
  http://stackoverflow.com/questions/14030561/zeus-rspec-fails-include-required-files-but-rspec-alone-does-fine
Use view_context_spec_helper in specs for PeoplePresenter
Use view_context_spec_helper in specs for ViewingEntries
Improve spec titles in people_presenter_spec
Add specs for ProjectsPresenter