Fixing .htaccess to ignore rewriting PHP files directly
Improve class naming and docs for DataList::applyFilterContext()
Added docs about which branch to choose
BUG: Confirmed Password Field now copies attributes to child fields.
Support for X-Reload header

Backported from 3.1. Required to get subsite's
"copy page to subsite" form submission working.
Clearer docs on using composer for contributions
upgrading 'Setting up an environment for contributing to SilverStripe' to heading 1

we do this to make it clearer that you can do the basic install OR a 'DEV' install - after that we list the advanced usage cases. 
Merge pull request #1077 from sunnysideup/patch-5

upgrading 'Setting up an environment for contributing to SilverStripe' 
Remove unncessary variable from TreeDropdownField
Merge pull request #1067 from halkyon/shorthand_ternary_op

Remove unncessary variable from TreeDropdownField
Merge pull request #1032 from halkyon/datalist_filter_docs

Improve class naming and docs for DataList::applyFilterContext()
Merge pull request #993 from halkyon/htaccess_fix

Fixing .htaccess to ignore rewriting PHP files directly
Removed incorrect line from contact form docs.

From disqus comments.
Update docs/en/tutorials/1-building-a-basic-site.md

Fixed typo in code block. UL tag was opening instead of closing.
Merge pull request #1084 from jcwacky/patch-1

Update docs/en/tutorials/1-building-a-basic-site.md
Merge remote-tracking branch 'origin/3.0' into 3.1

Conflicts:
	model/DataList.php
Fluent interface for TreeDropdownField
Default TreeDropdownField to TreeTitle

Same behaviour as in 2.x. All common elements displayed
in this field (SiteTree, Group, File) have a TreeTitle accessor.
Fix tree arrows in TreeDropdownField

Partially reverts "fixes" from 411673ed. This re-introduces the arrow on the main tree node in the CMS ("Your site name"), but that's less important than being able to navigate tree hierarchies in the first place in TreeDropdownField.
Add pointer to expand/collapse tree icons

Make it clear that they're interactive elements