Improve on metric collections and distribution

[ftbb]

Add new metrics to identify:

• mean call pickup time
• mean call length
• max call length
• max pickup time

Distribution should be configurable:

• Should consider implementation into JMX
• Database
• JMS implementation
• Live http streaming

[ftbb]

JMX implemented in commit: 0e612e2db947dd66a4fe288ebabbdb548f73da67