Updated gemfile to rails4
Remove whiny_nils, add eager_load.

whiny_nils is no longer needed in rails running on 1.9.3, as nil now throws method errors.
Run rake rails:update:bin to generate new binfiles for rails
Merge branch 'dev' into rails4

Conflicts:
	.gitignore
	Gemfile
	Gemfile.lock
Votable to strong_parameters
Merge pull request #140 from codeflash/dev

Dev
Update db schema because Rails 4 makes the syntax awesomer (syntax changes only)
updated dependencies
migrated database
updated the tests to the new names
fixed everything in the models and controllers
fixed everythingi n the views and seed. fixed #142
merge dev with ui branch
Merge pull request #149 from codeflash/dev

Dev
updated the validation of problem shortame. can be lowercase numbers and dashes
Added pagination to the solution pages. Made it so problem count was correct for languages
unbroked things
added problem name to solutions page
updated the problems index so it is paginated
added pagination to problem page's solutions fixed #135.