FIX 7906 Regression: GridFieldConfig_RelationEditor: Removing relation deletes data object
BUG FileNameFilter should remove any amount of underscores from start of filename

When a user renames a file to "__test.txt" (two underscores or more),
then FileNameFilter will only remove the very first underscore from the
filename. This is not sufficient, as any number of underscores in the
filename will be problematic when Filesystem::sync() is called, it will
remove that File record thinking it's an internal file. This fixes it
so any number of underscores are stripped out at the start of the filename.
Changes ping to POST and clears Requirements for ping

GET requests can, and do, get cached. Using POST forces them not to.
Clears requirements so that the SecurityAdmin JS isn't injected.
BUG Inspect current directory for include_path

This fixes problems where require/include calls rely
on the relative file path, e.g. in i18n.php.

Followup from https://github.com/silverstripe/sapphire/pull/904
Added composer.json
Added composer.json
Merge pull request #916 from chillu/pulls/current-dir-include-path

BUG Inspect current directory for include_path
Adding additional tests for special characters in FileNameFilterTest
Merge pull request #901 from halkyon/filenamefilter_underscores_fix

BUG FileNameFilter should remove any amount of underscores from start of...
Set method visibility to public in FileNameFilterTest
Batch actions UI enhancement (#7878)
Added docs for composer
Merge pull request #923 from sminnee/composer-docs

Added docs for composer
BUG Only include processed requirements at the top level. (Fixes #7847)

After each sub template was processed Requirements::includeInHTML() is included which appended requirements again.
Merge pull request #924 from wilr/open7847

BUG Only include processed requirements at the top level. (Fixes #7847)
FIX: Fixed details about version in composer create-project
Updating default en.yml with updated entities
Fixing broken references to sprites (probably caused by old Compass version)
Updated translations
BUGFIX: Multiple HTMLEditorFields not redrawing, fix by storing its container object before setting timeout