Added new class for checking requested map size and layer count
Added tests for GetMapLimitChecker

Conflicts:

	deegree-services/deegree-services-wms/src/main/resources/META-INF/schemas/services/wms/3.2.0/wms_configuration.xsd
Handbook: Added new WMS config parameter description
Integrated GetMapLimitChecker with WMSController. Added export of LayerLimit, MaxWidth and MaxHeight to WMS 1.3.0 capabilities.

Conflicts:

	deegree-services/deegree-services-wms/src/main/java/org/deegree/services/wms/controller/WMSController.java
Adapted to 3.4
Merge pull request #320 from occamlabs/3.4-feature-limit-wms-map-size

WMS: Add options for limiting map size and number of layers