8162546: change hidden options -Xdebug to --debug, -XshouldStop to --should-stop, and -diags to --diags
Reviewed-by: mcimadamore

8161019: javac, fold formatter options
Reviewed-by: mcimadamore, jjg

8078024: javac, several incorporation steps are silently failing when an error should be reported
Reviewed-by: mcimadamore

7177386: Add attribution support for method references
Summary: Add type-checking/lookup routines for method references
Reviewed-by: jjg, dlsmith

7191449: update copyright year to match last edit in jdk8 langtools repository
Reviewed-by: jjh
Contributed-by: steve.sides@oracle.com

7154127: Inference cleanup: remove bound check analysis from visitors in Types.java
Summary: Remove bound checking rules from recursive subtype visitors in Types.java and replace with centralized bound-checking logic
Reviewed-by: jjg, dlsmith

5088624: cannot find symbol message should be more intelligent
Summary: Resolve.java should keep track of all candidates found during a method resolution sweep to generate more meaningful diagnostics
Reviewed-by: jjg

6968063: provide examples of code that generate diagnostics
Reviewed-by: mcimadamore