Implemented wrapper around "ruby-progressbar" gem

* New dependency for capifony > symfony2 module (ruby-progressbar http://github.com/jfelchner/ruby-progressbar)
* Start a progress bar with capifony_progress_start (optionally takes a message)
* Update the progress bar with capifony_progress_update passing the current and total values
Implemented progress bar on "database:dump:remote"

* Example implementation of new capifony_progress_start & capifony_progress_update methods
* User will now get feedback on download progress
Merge pull request #375 from peterjmit/progress-indicator

Progress bar for long running tasks