First commit of a mongodb metrics-plugin.
Added the postgresql plugin.
Fixed a typo in README.md
Removed requirement for Ruby-1.9.3 (in Gemfile). Corrected the example-config.yml (service MUST be name postgresql). Minor updates to postgresql.rb for hardening. Updated the README.
Minor updates to mongodb.rb for hardening.
Fixed the periodic stopping of all plug-ins.
Changed identifier from dbname to hostname_dbname which is valuable when you have multiple postgresql servers with common database names.
Merge remote-tracking branch 'upstream/master'