fixed error in host group parsing in Zabbix backend
added support for host groups in Zenoss  backend
fixed overlapping of field in the editor
added host group in service tooltip + clean
updated changelog preparing for version 3.0.4
moved global.hpp to base.hpp
added group filter option for Zenoss and Zabbix backend
no longer append ping to device check id in Zenoss backend
refactoring conditions
removed deprecated include
added host group filter in livestatus backend filter
Merge pull request #40 from jameseriot/master

Several changes related to tickets #38 and #39
updated changelog for version 3.0.4
used from utf8 to convert raw data in QString in livestatus backend
fixed ticket #41 when chart is not correctly updated
fixed version display in welcome message
set target version to 3.0.5 and updated changelog
don't compute chart stats if no data
now retrieve data from livestatus using json
Merge pull request #44 from jameseriot/master

Misc fixes