Fix History date grouping, fix skills to review

Calculate the day from the questions with the created_at field.
Fix the responsiveness of the Skills to Review in custom-practice,
update them to have the same column amount. (12 units)
Merge remote-tracking branch 'grockit/master'
Add question stimulus back again in History Page

Create a filter to strip out the html tags.
Add the anchor that links to the question page as the entire row.
Improve the columns' responsiveness in the History Page list.
Merge remote-tracking branch 'grockit/master'
Merge pull request #90 from mlopez-firstfactory/master

Add question stimulus back again in History Page