Added the extension custom configuration that allows to set up test suite  wide properties.

I have added one final functionality - setting up the application id and the kayron environment for all the tests through arquilian.xml.

Example:
```
<?xml version="1.0" encoding="UTF-8"?>
<arquillian xmlns="http://jboss.org/schema/arquillian"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="
        http://jboss.org/schema/arquillian
        http://jboss.org/schema/arquillian/arquillian_1_0.xsd">

    <extension qualifier="kayron">
        <property name="applicationId">hello-netflix-oss</property>
        <property name="environment">dev</property>
    </extension>
</arquillian>
```

This can be still overriden with the RunInKaryon annotation.