Use new Warehouse URI: /gdc/datawarehouse
fix: description in Warehouse constructor is optional
fix JavaDoc errors (to comply with Java 8 JavaDoc parser)
Merge pull request #65 from martiner/mcl-dss

Use new Warehouse URI: /gdc/datawarehouse
Merge pull request #67 from martiner/mcl-warehouse

fix: description in Warehouse constructor is optional
Merge pull request #69 from martiner/mcl-javadoc

fix JavaDoc errors (to comply with Java 8 JavaDoc parser)
move util classes to util package
change date time fields from String to DateTime type