closes #467
closes #532

interval options should have string value

also mentioned name_override and name_prefix on top of name_suffix

closes #514

closes #519
closes #168

closes #475

closes #526
closes #525

fixes #508

While at it also add a missing dependency on lsof required by the
netstat plugin.

closes #512

closes #506

With HTTP JSON or Elasticsearch, one can also process values nested in arrays.

fixes #505

Packaging Updates

Added a `build.py` script for compiling and packaging. Added post and pre install scripts to handle installation and upgrades in a cleaner way. Minor fixes to the init script and service unit file.