Moved paragraph on installing Python libraries

So that Ubuntu/Debian users know what they should do first upfront.
Merge pull request #276 from pablofiu/patch-1

Moved paragraph on installing Python libraries
updating contribute tests
Merge pull request #278 from retornam/contribs

updating contribute tests
fixing notes header locator
Merge pull request #279 from retornam/notesfix

fixing notes header locator
Bug 993485 - remove webfwd link from tabzilla
Merge pull request #280 from retornam/remove-webfwd

Bug 993485 - remove webfwd link from tabzilla
Changed tabzilla links and photo links
Merge pull request #281 from AndreiH/new_link_changes

Changed tabzilla links and photo links
updating privacy policy page changes
Merge pull request #282 from retornam/privacy-updates

updating privacy policy page changes
Updating locators for new footer
Merge pull request #283 from retornam/footer-fix

Updating locators for new footer
Bug 999152 - Add Firefox Cloud Services Privacy Notice to www.mozilla.org/privacy
Merge pull request #284 from kyoshino/bug-999152-privacy-cloud

Bug 999152 - Add Firefox Cloud Services Privacy Notice to www.mozilla.org/privacy
Bug 979660 - [australis] redirect /firefox/technology to MDN
Removing performance and security pages