Fixed compilation issues on JDK 7 and JDK 8.  Refactored the DataSourceAdapter abstract, supporting class to implement the Java 7 DataSource.getParentLogger():Logger method.
Refactored and cleaned up deprecated and unchecked/unsafe Java and GemFire API usage.
Declared and implemented the findAll(:Sort) method from the SDC's PagingAndSortingRepository abstraction in SDG given GemFire supports ORDER BY in Queries.
Refactored and cleaned up Javadoc.
Merge branch 'sgf268' of github.com:jxblum/spring-data-gemfire into jxblum-pr64