User_agent library: robuster detection in is_referral()
Cache result of is_referral()
Merge pull request #2543 from vlakoff/develop-3

User_agent library: robuster detection in is_referral()
Fix too verbose error logging on default production environment

issue was present on PHP < 5.4
Merge pull request #2545 from vlakoff/develop-3

Fix too verbose error logging on default production environment
Fix Form Validation issue with text inputs which have array as name

Signed-off-by: Hashem Qolami <hashem@qolami.com>
change empty function to Identical comparison operator

Signed-off-by: Hashem Qolami <hashem@qolami.com>
Merge pull request #2547 from HashemQolami/patch-1

Fix Form Validation issue with text inputs which have array as name
[ci skip] Small upgrade notes fixes
Change class filenames to Ucfirst
Fix CI_Loader::model() tests
Fix Loader_test::test_non_existent_model()
[ci skip] Add a changelog entry for class file naming rule change
[ci skip] Fix style guide typos
Give Drivers a higher priority in the autoloader