Bug 1054437: Add contribute numbers to settings and global context.

This is just for the hard-coded numbers until we get them automated.
Bug 1080634 - Update the Install link to point to a more relevant help page + Provide different URLs for Desktop & Mobile
Bug 1049856: Add convenience methods to events app.

For home and contribute pages.
Merge pull request #2359 from pmclanahan/add-events-convenience-methods

Bug 1049856: Add convenience methods to events app.
Merge pull request #2357 from pmclanahan/hard-code-contrib-numbers-1054437

Bug 1054437: Add contribute numbers to settings and global context.
Merge pull request #2350 from sylvestre/master

Bug 1080634 - Update the Install link to point to a more relevant help p...
Bug 1054437 - Get Involved redesign
Add Mozillian stories, form updates
Responsification in progress
Update story strings
Remove maps and country switcher
Bug 1054437: Add newsletter form to new contribute pages.
Bug 1054437: Make new contribute form work.
Do not preselect country in get involved form.
Some form tweaks

Better info icon placement
Some error styling
Show area for selected category on pageload
Responsification
Add event data to contribute pages.

WIP
Add event data to contribute pages.

Also l10n format numbers.
Add real data to events page.
Responsification, added email format options