Merge pull request #1517 from ubernostrum/new-relic-879978

Fix bug 879978: Add New Relic to MDN.
fix bug 925056 - Make TOC scroll with the user
Merge pull request #1508 from darkwing/scrolling-toc-925056

fix bug 925056 - Make TOC scroll with the user
Merge pull request #1509 from darkwing/double-scrollbars-926616

fix bug 926616 - Move overflow prevention to only place it's used, zone
Merge pull request #1510 from darkwing/heading-margin-926896

fix bug 926896 - Prevent header misalignment in the wiki
Merge pull request #1511 from darkwing/remove-reviewed-926858

fix bug 926858 - Remove 'last reviewed' text from wiki pages
Merge pull request #1512 from darkwing/scrolling-WYSIWYG

Make the WYSIWYG toolbar scroll with the editor in all cases
Merge pull request #1514 from darkwing/folder-arrows-917263

fix bug 917263 - Change up arrow to right arrow in togglers
Merge pull request #1515 from openjck/append-etc-hosts

Update docs to append to, not replace, /etc/hosts
Merge pull request #1502 from nhenezi/descriptive-attachment-messages

Bug 909529 - improve upload attachment error message
Fix masthead paragraph margin from overflowing

Masthead paragraph was going under masthead image in
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox_OS. This patch
fixes the behaviour.

Remove masthead paragraph right margin from tablets.

Before: http://i.imgur.com/p4AtXGu.png
After: http://i.imgur.com/XD0oMba.png

Signed-off-by: Kaustav Das Modak <kaustav.dasmodak@yahoo.co.in>
Merge branch 'master' into empty-search
Add a11y anchor links to allwo for a11y navigation
mime_types now behaves as wrapper for mimetypes.

mimetypes does not allow overwriting stored values (stored in
mimetypes.knownfiles). This wrapper allows us to define our own mappings and
fallback on mimetypes if mime type is not found.
Merge pull request #1477 from darkwing/empty-search

Provides message when no search is performed.
Merge pull request #1513 from kaustavdm/fix-masthead-paragraph

Fix masthead paragraph margin from overflowing
Merge pull request #1518 from darkwing/a11y-anchors

Add a11y anchor links to allwo for a11y navigation
fix bug 915314: Use preformatted styling for code in script warning messages
fix bug 927569 - Ensure right column has width when TOC becomes fixed
Merge pull request #1521 from darkwing/page-column-927569

fix bug 927569 - Ensure right column has width when TOC becomes fixed