Added some javadoc
Removed advanced configuration from intro. Will need a section about this later in the README.
        <property name="maxActive" value="16" />
        <property name="maxIdle" value="8" />
        <property name="minIdle" value="0" />
        <property name="initialSize" value="0" />
        <property name="maxAge" value="1500000" />
        <property name="validationQuery" value="SELECT 1" />