8029235: Update copyright year to match last edit in jdk8 jdk repository for 2013
Summary: updated files with 2011, 2012 and 2013 years according to the file's last updated date
Reviewed-by: tbell, lancea, chegar

8012665: add CharSequence.chars, CharSequence.codePoints
Reviewed-by: martin, alanb, ulfzibis, mduigou
Contributed-by: Stuart Marks <stuart.marks@oracle.com>, Henry Jen <henry.jen@oracle.com>

8004982: JDK8 source with GPL header errors
Reviewed-by: ohair

6206780: (str) Forwarding append methods in String{Buffer,Builder} are inconsistent
Summary: update StringBuilder & StringBuffer to consistently handle forwarding to AbstractStringBuilder. Some additional cleanup (removal of refs to sub-classes from AbstractStringBuilder)
Reviewed-by: chegar, alanb, mduigou