Closes #1074 : UI - Post deadline submissions

addition of a warning in the results/edit page for a post deadline
submission.
Checking in the controller instead of the view

Changing class 'error' with 'warning'
Another bug I forgot
Changing location of the method past_due_date? in model Grouping
Closes #570 : Assignment due date with sections

- Add error message to show which section(s) is in past
- Add method to know the sections' names
- Modification of past_due_date? which doesn't work in some cases
Fix: typo (missing +)
Added new contributor
Add unit tests

(problem with commit)
Closes #1077: add link to directly go to submission

 - addition of a link and its translation
 - small indentation in _list_manage
 - sorry for 80 chars, I can't seem to do better...
Merge pull request #1089 from GhiGt/issue-1077

Closes #1077: add link to directly go to submission
Add RubyMine folder to .gitignore

 - .idea
add teardown with destroy_repos to do not have the error of filenames
Changing from result to results because of the has_many
Merge pull request #1076 from GhiGt/issue-1074

Closes #1074 : UI - Post deadline submissions
Merge pull request #1091 from GhiGt/rubymine

Add RubyMine folder to .gitignore
Merge pull request #1090 from benjaminvialle/NewContributor

Added new contributor
Update README.rst and markus-contributors.txt with students from UCOSP Winter 2013
Merge pull request #1093 from danielstjules/ucosp-contributors

Update README.rst and markus-contributors.txt with students from UCOSP Winter 2013
Merge pull request #1092 from GhiGt/patch-result

Changing from result to results because of the has_many
Ruby style for app/controller/api