Fix HTMLText AbsoluteLinks not parsing placeholder

Add an AbsoluteLinks method to HTMLText that parses placeholders instead of returning the raw value.
Fixing FormField not setting readonly attribute on setReadonly(true)
Upload: refactor file versioning
Fix: WYSIWYG now returns valid HTML in tables

The WYSIWYG by default creates invalid HTML5. Creating a table and running it through W3C validator returns the following error: The border attribute on the table element is obsolete. Use CSS instead.
Add Behat behaviours to click links and submit forms in preview.
Update index.md

topics/templates doesn't exist.
Merge pull request #3003 from OliBridgman/patch-1

Update index.md
Merge pull request #3000 from mateusz/preview-behaviours

Add Behat behaviours to click links and submit forms in preview.
BUG Fix Date and SS_DateTime::FormatFromSettings
This issue is caused by the odd default behaviour of Zend_Date, which attempts to parse yyyy-mm-dd format date and times as though they were yyyy-dd-mm.
Merge pull request #3002 from tractorcow/pulls/3.1-datetime-fix

BUG Fix issue with SS_DateTime::FormatFromSettings failing to parse dates
Update datefield.md

Removed ; at the end of ->setConfig('dmyfields', true) in the three chain example. Is confusing for new users/developers who are not aware of how to chain methods.

Closes #3006
Update dataobject.md

This page is grid-field not gridfield.
Merge pull request #3009 from scottmcmurray/patch-1

Update dataobject.md
Info about getting set up using composer and MAMP

Added by request of Gábor Novoszádi from community feedback and thanks to the gist from @kkirsche. I have supplied a link to the gist as it is well written, with permission we may look to rework for direct inclusion at some point :)
Docs / Tests for Director::absoluteURL
Merge pull request #3011 from tractorcow/pulls/absurl

Docs / Tests for Director::absoluteURL
Prevent IE errors on hidden login forms

In order to focus a field, it needs to be visible,
which can't be guaranteed on a core level by the login form JavaScript.
Optionally check for visibility via jQuery if it exists,
and allow explicit disabling of this behaviour via a unique identifier.
Add 3.0.10 upgrade docs
Merge pull request #3010 from camfindlay/patch-3

Info about getting set up using composer and MAMP
FIX - missing link url for composer

My bad, have amended this.