Update of XML configuration in IDM works for JPA, LDAP and File IdentityStores
Added testcase for Custom IdentityConfiguration parsed with XML
PLINK-222 Change IdentityConfigurationBuilder.named to return previous value if it already exists with this name
PLINK-83 Added XMLConfigurationOperationsTestCase for init IDM from XML and call some operations
Merge pull request #169 from mposolda/master

PLINK-83 PLINK-222  Support for XML configuration for IDM