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
Merge remote-tracking branch 'origin/2.4' into 3.0
Updated translations
Create nl_NL.js
Merge pull request #288 from ARNHOE/patch-2

Translation: nl_NL.js
Hardcode travis branch on dependencies, otherwise breaks pull request builds

Pull requests are always on a branch, and this branch
typically is not present on the installer.

This changes means we need to be careful when merging into 3.1
and master, but that's a necessary evil.