Update base.js

Problem occured during my dev
Update jQuery form plugin to v3.45.0

Fix #868
Fix #1729
Restore IE workaround 

https://github.com/sonata-project/SonataAdminBundle/pull/1797#issuecomment-28623826
Merge pull request #1797 from Maks3w/patch-3

Update jQuery form plugin to v3.45.0
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
[select2] Enable search/autocomplete by default for all select fields

Enable search for all selects without care about the minimum items improves the productivity when use the keyboard for jump between fields (tab key) and use the alphanumerics keys for introduce values in all kind of values without to move the hands to the cursor keys (when search is not enable)