Added composer.json
Added travis support
Added README with build status
Fixed travis.yml paths
More graceful handling of missing GET data in ModelAdmin

See https://github.com/silverstripe/silverstripe-cms/pull/253
BUG Consistently use FormResponse in CMS JavaScript (fixes #8036)

Regression caused by a security fix in 9bf3ae9a190
Fixed composer.json dependencies
Using new "Security.login_url" configuration value
Reduced code duplication in ErrorPage (no functional changes)
Extracted ErrorPage default data to getter

Allows for less verbose overloading, while still keeping i18n capabilities
in place, which isn't possible with DataObject::$default_records
Excluded Postgres from Travis (breaks build due to internal errors)

We'll need to fix the "no space left on device" issue,
most likely caused by Postgres keeping too much of a query log,
or somehow creating a history of past data.
For now, having a Postgres build breaking the whole
build process (incl. MySQL builds) does more harm than good.
ENHANCEMENT: Do not display SilverStripeNavigator_CMSLink when in a LeftAndMain extension not just CMSMain extensions
Merge pull request #283 from UndefinedOffset/3.0

ENHANCEMENT: Hide SilverStripeNavigator_CMSLink when in a LeftAndMain extension not just CMSMain extensions
FIX: updateCMSFields not accepting var by reference

updateCMSFields should be taking the fields var by reference.
@see https://github.com/silverstripe/sapphire/pull/1156
Merge pull request #284 from mandrew/patch-1

FIX: updateCMSFields not accepting var by reference
FIX Respect escaping rules on readonly fields in CMS history view

Avoids showing unescaped HTML on fields which didn't allow it otherwise,
e.g. TextField. This also fixes problems with SiteTree->ExtraMeta
which got evaluated within the CMS. If this section contains any
JavaScript it gets executed and can disrupt CMS operation.
Revert "FIX: updateCMSFields not accepting var by reference"

This reverts commit e56a78b1605ea958d844b4efca507074d5050c71.
Merge remote-tracking branch 'origin/2.4' into 3.0
Updated translations
Create nl_NL.js