Improved symfony security dependency
Merge pull request #4312 from GrahamCampbell/4.1-security

[4.1] Improved Symfony Security Dependency
Updated Queue SqsConnector to be able to support other AWS SDK options.
Merge pull request #4326 from jeremeamia/4.1

Updated Queue SqsConnector to be able to support other AWS SDK options.
Improved badges
made Schema::getColumnListing method public
Merge pull request #4357 from alexgalletti/4.1

Made Schema::getColumnListing method public
Return false if value is not a file.
Updated contribution guide
Merge pull request #4334 from GrahamCampbell/4.1-badges

[4.1] Improved Badges
Merge pull request #4367 from GrahamCampbell/4.1-contr

Updated Contribution Guide