Check for Boolean fields when converting to GSR JSON
Merge pull request #27 from tkunicki/2.3.x

Added support for ExternalGraphic image url encoding and vending
renaming monitor-console to mapmeter, fixes #19
removing old analytics module
changed mapmeter pom groupId, #19
improved connection checker logic
send over system data to mapmeter on startup
send system data in separate thread
rename console -> mapmeter (closes #21)
Avoid newlines in base64-encoded images
quote table name in drop stmt
use concatErrorMessages for progress error
fix potential NPE if item cancelled
prevent leaking connections

Re-use the same client instance, and thus connection manager with each
request. Also call close idle connections to force their closure. This
is probably unnecessary as re-using the same simple http connection
manager should give back the same connection every time.
immediately close other connections to mm

* system data is sent once on startup
* each connection check should be closed immediately
Relax requirement that styles not have scale constraints
don't show the "Activity" and "Reports" pages

In the Geoserver admin, don't show the activity and reports pages in the
monitor section. Mapmeter is the only link that shows up there now.