BUG Director::test now calls RequestProcessor

This fixes https://github.com/silverstripe/silverstripe-framework/issues/2517
and provides some testing around the use of RequestProcessor in general.
FIX PasswordValidator->characterStrength() Documentation
Merge pull request #2540 from JayDevlin/fix-passwordvalidator-characterstrength-documentation

FIX PasswordValidator->characterStrength() Documentation
Allow https YouTube oEmbed URLs

YouTube's oEmbed service supports a ?scheme=https parameter. See https://groups.google.com/forum/?fromgroups#!topic/youtube-api-gdata/S9Fa-Zw2Ma8
Merge pull request #2541 from kinglozzer/patch-2

Allow https YouTube oEmbed URLs
Merge pull request #2536 from nyeholt/3.1

BUG Director::test now calls RequestProcessor
Update rssfeed.md

add $allowed_actions
Merge pull request #2544 from cieszak/patch-2

Update rssfeed.md
$i18nScriptDirection template placeholder

Optional RTL support based on Zend_Locale data.
Not set in CMS by default because it breaks the layout
quite badly without deep CSS modifications.