Update FilterPaneTagLib.groovy

Fixed problem that caused IllegalArgumentException while enum value was not set. The exception was caught silently so it was not obvious that it was thrown. I saw it while debugging.

Also fixed problem that valueMessagePrefix was not used for enum values unless values were explicitly specified. Removing the optionValue from ctrlAttrs made the trick.
Merge pull request #38 from stenix71/patch-7

Update FilterPaneTagLib.groovy
Update filterpane.gdoc

Added documentation about the valueMessagePrefix which can make it possible to localize enum values in a more custom way.
Merging change and attempting to remove hibernate dep from service.  Will try and use class loader instead to see if it is available.
Merge pull request #39 from stenix71/patch-8

Update filterpane.gdoc
Update internationalization.gdoc

Added description about internationalization of select input form. Not sure about the wiki syntax here but I wanted to have an enumerated list.
Merge pull request #40 from stenix71/patch-9

Update internationalization.gdoc
Adding fixes from demo project breaking when using sub class filtering
adding table per hierarchy mapping example to docs
Fixing groovy truth null check to use literal null instead of object 'null'
Fixing NPE for bugzilla 118
Fixing NPE for bugzilla 118
Fixing NPE for bugzilla 118
Fixing locations in build config for dep reso
Making exec
Upgrading to grails 2.3.8 and fixing DomainPropertyComparitor issue and lower casing the i18 class name for matching with grails docs scaffolding http://grails.org/doc/latest/guide/i18n.html#scaffoldingAndI18n
Moving to latest version of release and rest client builder
cleaning up code
Adding russian language support file
Merge branch 'feature/root-criteria' of https://github.com/epyx-src/grails-filterpane into feature/root-criteria

Conflicts:
	FilterpaneGrailsPlugin.groovy