4.4

Issues:

#103 - Handle @nAmed with empty string / no actual string qualifier name
#102 - Tidy generated code for field injection
#101 - Fix isAddBeanFor() to include implementation type with interface types bug
#100 - Support Optional as result type of @bean methods. Support Optional and @nullable for injection
#99 - Support @Inject on method with no arguments bug
#98 - Support @singleton that extends another concrete @singleton
#97 - Refactor to register using explicit types rather than bean.getClass() canonical name
#96 - Case insensitive qualifier names