Updates to speeches metadata

• update speech type explanations
• move the explanations from summary to metadata
• delete unecessary summary partial from speeches folder (speeches had it's own partial because of the differences required for speeches)
• add css to make first letter uppercase

https://www.pivotaltracker.com/story/show/49530311
fixing failing tests

• 1 failing because of missing class
• the other failing because explanation text has changed
Merge pull request #855 from alphagov/updates-to-speeches-metadata

Updates to speeches metadata

https://www.pivotaltracker.com/story/show/49530311