Make navigation scalable
Allow Date fields to be required. Closes #1206
Bump to 2.3.1dev
Fix Author field settings panel to enable multiple authors and default to current author options
Merge branch 'integration' of github.com:symphonycms/symphony-2 into navigation
Fix for #1340
Merge pull request #1341 from nilshoerrmann/navigation

Allow the navigation to scale better when the screen is smaller (or you have heaps of navigation groups!). Fixes #1281
Merge pull request #1342 from klaftertief/integration

Fix missing shadow. Closes #1340
Tidy up README, fix 2.3.1dev migration file
Fix the Datasource Editor for Providers in localised installs
Textarea's without formatters now follow the same logic as the unformatted textarea. Fixes #1337
If a Duplicat has no .content, don't display a drop shadow. Fixes #1339
Wrap localStorage setting in try/catch. Closes #1334
Documentation fixes for the DataSourcePre/PostExecute delegates
Handle array syntax for URL parameters. Fixes #1348
Style .type in the frames CSS instead of just span
Add a View Page button to the Pages Editor. Closes #1350
Revert "Style .type in the frames CSS instead of just span"

This reverts commit d560fe433534761796cb268ff3395492ae54a9d5.
Fix typo in General::deleteDirectory function. Closes #1362
A more robust fix for #1348