Add JSON output as an alternative to 'tabbed' format

[kosloot]

The 'tabbed' format is quite rigid, and sometimes difficult to read. (especially when some modules are skipped).
It might be handy to create JSON output as an alternative. This might really be useful for the SERVER mode.

NOTE: consider JSON input for the server too then,

[proycon]

This would indeed also be useful for the python-frog binding... more robust parsing..

[kosloot]

A first attempt is in GIT now. Needs some testing.

[kosloot]

nobody complained about the JSON