Fix build properties
Add GWT compilation
Add EntityQueryElement.value methods
Minor cleanup
Add EntityQueryExistsPredicate
Create GWT tmp under build
Add some shared ignores
Refactor SQL data type class hierarchy
Refactor type class hierarchy
Move syntax classes to env packages
Add authors file
Add sample code links
Sample code links as list items
Minor cleanup
Minor comment changes
Improve naming attribute mapping related interfaces
Refactor expr package
Add EntityQueryInPredicate
Add support for effectively immutable entities
Use distinct java type to implement entity primary keys