Implementation of first story: nesting support for areas

Today we started the first iteration with a story about enabling nesting of areas in the core product of voluntary.

On the areas page we only show root areas and on the area page we now show a table of child areas.
We also implemented a link on the area page to add a new child area by passing the current area as the parent through the new area form.

Tomorrow I will complete the story with the last open task to show the current path in the breadcrumb of the area page, increase the test coverage and start the next core story about filtering projects by area.

During the resolution of this story Mathias showed me some methods about studying new and old code to integrate a feature well like interaction diagrams and code traces.
I also get to know debugging to fix today's bugs with a debugger in a IDE like RubyMine, the debugger gem for the terminal, debugging for the poor man (raising exceptions) and the gem better_errors.

I also installed Aptana on my laptop to compare with Sublime.

Tomorrow more!!