Improve release_notes view to fix multiple bugs

Map URLs within bedrock for bug 978931

Map firefox os release notes urls to new RNA powered release_notes
view, with fallback to manual templates for 1.0.1, 1.1, and 1.2 to
support the template development for bug 978988

respect Release.is_public flag unless settings.DEV is True

Map auroranotes to RNA release_notes view

Beta notes will also work if the version # matches the version_re,
which for example 28.0b1 will, but 28.0beta will not

We no longer "fix" version numbers like 27.0 -> 27.0.0 -- this was
an artifact of data migrations that we need to fix in the nucleus
DB now that we've gotten past those migrations

The release_notes view now expects the version string to be unique per
product

mobile release notes are not yet supported, further work
will be done as part of Bug 965012.
Merge pull request #1754 from jgmize/release-notes-improvements

Improve release_notes view to fix multiple bugs
Bug 983863 - Change Mozilla MTV office address from 650 Castro Street to 331 E. Evelyn Avenue.
[fix bug 975099] Australis /firstrun and /whatsnew onboarding tour for beta
Add FxOS 1.3 release notes. Bug 981176.
Merge pull request #1772 from jpetto/bug-981176-fxos-1.3-release-notes

Add FxOS 1.3 release notes. Bug 981176.
Merge pull request #1778 from mozilla/australis-tour-updates

[fix bug 975099] Australis /firstrun and /whatsnew onboarding tour for beta
Bug 981092 - update /gigabit copy according to https://docs.google.com/a/mozillafoundation.org/document/d/1DLFHbXvxsynWqacUkn8wVxSDJfzvKEuFYhOfEW8iFOY/edit?disco=AAAAAGAHhqo&pli=1#
Merge pull request #1784 from retornam/fixaddress

Bug 983863 - Change Mozilla MTV office address from 650 Castro Street to...
Merge pull request #1768 from mmmavis/bug-981092-add-gigabit-copy

Bug 981092 - Update /gigabit copy according to the given text on GDoc