Update base.js

Problem occured during my dev
Added tests for Admin methods: getRoot, getRootCode, setPersistFilters, getExportFields
Merge pull request #1804 from pulzarraider/admin_test2

Added tests for Admin methods: getRoot, getRootCode, setPersistFilters, getExportFields
Added test for historyViewRevisionAction
Merge pull request #1807 from pulzarraider/controller_history_view_test

Added test for historyViewRevisionAction
Added tests for batchAction In CRUDController
Merge pull request #1810 from pulzarraider/crud_test2

Added tests for batchAction In CRUDController
SonataAdminBundle translation to Lithuanian language
Merge pull request #1811 from drawgas/master

SonataAdminBundle translation to Lithuanian language
Minor CS fix in CRUDController
Merge pull request #1812 from pulzarraider/crud_cs_fix

Minor CS fix in CRUDController
Add a Bitdeli badge to README
Merge pull request #1813 from bitdeli-chef/master

Add a Bitdeli Badge to README
Optimize Admin loading
Merge pull request #1794 from Th3Mouk/patch-1

Update base.js
- Add new method to admin extension to add persistent parameters + alter object instance - Add AbstractTranslatableAdminExtension
fix issue with persistent parameters