Pull view for version data to partial.

Update the piece's show page to use this partial.
Add version link on piece versions path
Add VersionsController#show action
Add Versions#show view and related examples
Update aesthetics of Version spec
Add Version#short_title and specs
Add Piece#short_title and specs
Adjust nesting of short_title examples
Update version spec for respond_to #short_title
Add annotate gem
Annotate models
Fix #30 - Autofocus on title for piece form
Hide flashes div when there are none
Fix #34 - Add piece bar for pieces/versions nav

Update styles for the piece bar.
Remove the create_button partial since it has been wrapped into the
piece bar.
Add piece_bar partial.
Change piece links and versions link class names.
Add piece bar to Pieces#index and add specs.
Move piece_links and versions_link to same area on
PiecesController#index.
Add piece bar to Pieces#show and add specs.
Add piece bar to Versions#index and add specs.
Add piece bar to Versions#show and add specs.
Modify pieces management specs to cover these changes.
Modify versions management specs to cover these changes.
Add shared examples for specs to use for the piece bar.
Fix indent in Versions#index