4884238: Adds java.nio.charset.StandardCharset to provide static final constants for the standard charsets.
Reviewed-by: alanb, sherman, darcy

Reviewed-by: dholmes

Reviewed-by: sherman

Reviewed-by: sherman

Reviewed-by: chegar, sherman

Reviewed-by: xdono

Reviewed-by: forax

Reviewed-by: darcy, weijun

Reviewed-by: chegar

Reviewed-by: alanb

Summary: Fix up jsr203 file javadoc related to symbolic links
Reviewed-by: alanb

6844313: New I/O: File timestamps should be represented by a FileTime rather than a long+TimeUnit
Reviewed-by: sherman

Reviewed-by: alanb

Reviewed-by: vinnie
Contributed-by: cquinn@google.com

4313887: New I/O: Improved filesystem interface
4607272: New I/O: Support asynchronous I/O
Reviewed-by: sherman, chegar