Add feature specs
Show burndown name
Show iteration number
Show iteration duration
Add link to pivotal tracker
Style burndown#show

 * Refactor styling
 * Refactor some steps for new data formats
Merge pull request #17 from kabisaict/improve_burndown_view

Improve Burndown View
Remove 'Burndown' from title
Use proper iteration ordering in decorator.
Rewrite factory for burndown with metrics
Use burndown#current_iteration in the decorator
Use burndown#current_iteration in cucumber steps
Move iteration responsibilities to Iteration
Merge pull request #24 from kabisaict/fix_decorator_with_iterations

Refactor Iteration responsibilities.

Things like iteration start and finish dates and generating iteration JSON data are now handled by Iteration instead of Burndown.
Refactory IterationDecorator spec
Return JSON for entire iteration length

If an iteration takes 2 weeks, but you're only
3 days into the sprint, Iteration#to_json will return
14 metrics, the first 3 filled, the last 11 filled with
zero values.
Merge pull request #23 from kabisaict/23_show_all_days_in_iteration

Show all days in interation
Add feature spec
Add previous iteration links
Show previous iterations.