Move the month widget into a 'sidebar' template

this way it can be reused with other common sidebar content
Add a method to get a month widget
Render the sidebar on upcoming and add an hcalendar template
add a method to generate the upcoming url
add a method to the controller to get the upcoming url
Move sidebar content out of controller template
Update old classes
Don't double encode
Merge pull request #38 from mfairchild365/issue-10

Display side bar on upcoming view