Wrote generic populate and populate_hierarchical in initial_data.rake
task. Added initial environment data.
Fixed a typo in initial_data.rake; made a view helper for hierarchical
representation of choices in the select tag; switched to
hierarchical_select in environment _form partial
Modified views
Added bootstrap framework to the bundle
Created custom stylesheet and started to tune appearence
Changed forms style
Changed form fields appearance
Modified index views
Applied table styles
Added link for creation at the top of index views
Switched select in new Environment to display multiple choices at once
Switched Sign in form to the horizontal layout
Icons for navigation links in the header
Forbidden the selection of multiple choices of the parent id in
Environment form
Display single Environment with its parent id, if present
Added Complexities
Added Complexities to the header links
Tuned Complexities views
Initial data for Complexities
Restricted access to Complexities