Merge pull request #585 from mozilla/DisabledCiphers

Initial checkin of new policy DisabledCiphers

diff --cc README.md
Simple merge

diff --cc mac/org.mozilla.firefox.plist
Simple merge

diff --cc windows/de-DE/firefox.adml
Simple merge

diff --cc windows/en-US/firefox.adml
Simple merge

diff --cc windows/es-ES/firefox.adml
Simple merge

diff --cc windows/firefox.admx
Simple merge

diff --cc windows/fr-FR/firefox.adml
Simple merge

diff --cc windows/it-IT/firefox.adml
Simple merge

diff --cc windows/zh-TW/firefox.adml
Simple merge