[maven-release-plugin] copy for tag org.gvsig.legend.graduatedsymbols.app.mainplugin-1.0.4
refs #3210 Actualizada la version del parent y sustituidos los JIncrementalNumberField por JNumberSpinner
Updated pom.xml files, assembly file name, etc.
Fixed management of default symbol
Fixed imports
Fixed management of shape types and persistence
Set orange as initial color in background symbol preview button
Removed buggy and unnecessary 'set' method
Initial import.