Update modeladmin.md

Corrected many broken link-renderings. Also removed the "Related" link to [genericviews Module](http://silverstripe.org/generic-views-module) because it doesn't work, and I can't it elswhere.
Update forms.md with additional code in MyForm.ss

Show two ways of reaching a nested field plus that field's validation message
Merge pull request #3219 from AntonyThorpe/patch-1

Update forms.md with additional example code in MyForm.ss
Fixes to the :::ss parsing - extra tabs were breaking it.
Merge pull request #3223 from camfindlay/patch-6

Fixes to the :::ss parsing tutorial 1.
Better support for overloading start and destroy methods in Session

Move functionality from static start and destroy functions into instance
methods, allowing these to be overloaded. This works the same way as
calling Session::set() which then in turn calls inst_set()

Additionally use Injector to create the default Session instance to
allow the class to be swapped out.
Update javascript.md

Replaced deprecated jQuery live() with on(), updated link to documentation.
Merge pull request #3228 from daslicht/patch-1

Update javascript.md
Merge pull request #3216 from halkyon/session_inst

Better support for overloading start and destroy methods in Session
Adding some more commonly used SS_Log priority constants.
Merge pull request #3225 from halkyon/log_constants

Adding some more commonly used SS_Log priority constants.
Update i18n.php

Correct common_languages for Norwegian to use 'nb' and not 'no'
Merge pull request #3230 from tscole/patch-1

Update i18n.php
FIX Add support for compositedbfield within many_many_extraFields

Previously selectFromTable would simply try to select the composite field name. This expands the extraField name to include the children field names and uses CompositeDBField::writeToManipulation to generate the correct SQL for the queries.
Remove PHP 5.6 from allowed failures

PHP5.6 is due for release rather soon, so we should be ready for it
BUG using isDev or isTest query string no longer triggers basic auth
BUG: Fix incorrect common_languages config
Merge pull request #3255 from tractorcow/pulls/3.1/fix-i8n-locale

BUG: Fix incorrect common_languages config
Updated HtmlEditorField Field()

I had a need to use onBeforeRender on a DataExtension of
HtmlEditorField and noticed it wasn't there. Added return
parent::Field($properties) use FormField::Field which utilizes
onBeforeRender.
Merge pull request #3256 from tylerkidd/htmlEditorField_Field_fix

Updated HtmlEditorField Field()