[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

[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

Use Bootstrap 3.3

Unless there is a reason why not?

[5.3] Add config for new Memcached features

Adds config for persistent connections, SASL authentication, and custom options

Add npm scripts

Switch to `.scss`

Tweaked config

Update Kernel.php

Fixed typo

Fixed up the phpunit config

Add support for the authorize middleware and AuthorizesRequests trait

Bump package versions