Updating embedded calendar to follow http://software-carpentry.org/bootcamps.ics

I made a Google calendar on the admin@software-carpentry.org account that
follows our generated calendar file and switched the embedded calendar to
point to that. I also added some margin space to the bottom of the map div
to put some room between the map and calendar.

Signed-off-by: Matt Davis <jiffyclub@gmail.com>
Removing some items from the embedded calendar.

Specifically the title, print icon, and calendar list menu (since we have
just one calendar).

Signed-off-by: Matt Davis <jiffyclub@gmail.com>
Adding a link to the calendar feed below the embedded calendar.

I also added an swc-blue-bg class to swc.css that sets the background
color to SWC Blue. It can be used in conjunction with the Bootstrap label
class to make an SWC Blue label. And I updated the footer labels to use it.
Merge pull request #171 from jiffyclub/new-calendar

Updating embedded calendar to follow http://software-carpentry.org/bootcamps.ics