Creating rubric, rubric_category, and rubric_submissions models, migrations, associations
created rubric, rubric_categories objects and controllers and created nested new rubric form

This commit includes rubrics/new working with nested form for to create a new rubric and categories
nested working with hardcoded number of categories
Created pages for creating a new rubric, and updating existing rubric.

This is a work in progress commit. Do not merge this branch yet.
Merge branch 'master' into rubric_branch
Merge branch 'master' into rubric_branch
Integrated Submissions Pie Chart into Student Overview

Using HighCharts via the lazy_high_charts gem. Chart is created in the user_controller and displayed in the users/show.html.erb view.
changed color scheme
rubric new, show, edit pages are complete
video now stays the size of the screen. YAY
Completed graph for Flesch-Kincaid Readability Score Over Time on the Student Overview page.

Graphs created in users_controller.rb and rendered in views/users/show.html.erb
Merge branch 'master' into homepage_styling
Merge pull request #82 from whoisglover/rubric_branch

Rubric new, edit, show
Merge branch 'master' into style_rubric
Cleanup and decided to remove vocabularic complexity graph
styled the ecreate/edit rubric page
Merge pull request #83 from whoisglover/homepage_styling

Homepage styling
Merge pull request #84 from whoisglover/student_overview_charts

Student overview charts
Merge pull request #85 from whoisglover/style_rubric

Style rubric
Fixed tag translation issue.