[5.3] Return JSON for unauthenticated AJAX requests

[5.3] Use proper PDO fetch style

This config option ties in with changes in fbd6e77 that were tagged in
v5.2.35 of the framework.

Make TestCase abstract

[5.3] Update `can` middleware to new namespace

Add missing Mandrill secret keys in config.services

[5.3] Remove the Authenticate middleware

[5.3] Make the Authenticate middleware throw an AuthenticationException

[5.3] Added the new bindings middleware

[5.2] Get guest middleware using guestMiddleware() method in ResetsPasswords

Applied fixes from StyleCI

[5.3] Add "sslmode" setting for PostgreSQL connection

The commit https://github.com/laravel/framework/commit/586bffa1d758e09114821b694b5e800cc9bbfb5f added support for sslmode in PostgresConnector.php and sslmode has been around since postgres version 9.1 (2011). 

This change makes it possible to specify sslmode from the config file.

Also serves as documentation to other developers so they don't have to
dive deep into the code to figure out that it's posible to set this option.

The posible values for sslmode are:
    disable, allow, prefer, require, verify-ca, verify-full

The default value is "prefer".

http://www.postgresql.org/docs/9.5/static/libpq-ssl.html#LIBPQ-SSL-PROTECTION

Add language line for image dimensions validation rule

[5.3] Enabled MySQL "strict" mode by default

Merge branch 'feature/session-store-config' of https://github.com/tomcastleman/laravel into tomcastleman-feature/session-store-config