8055262: Update jdk/test/java/util/Base64 tests to remove use of sun.misc.BASE64Encoder/Decoder
Reviewed-by: mchung, sherman
Contributed-by: amy.lu@oracle.com

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

8028397: Undo the lenient MIME BASE64 decoder support change (JDK-8025003) and remove methods de/encode(buf, buf)
Summary: updated the spec and implementation as requested
Reviewed-by: alanb

8025003: Base64 should be less strict with padding
Summary: updated spec and implementation of mime decoder to be lenient for padding
Reviewed-by: alanb

8004088: hg push for bug#4235519 failed to push all files
Summary: pushed all base64 files
Reviewed-by: alanb, mduigou