Make advent2012-day04.t a stress test

Takes around 20 sec to run @moar and 1 min @jvm
Also add integration/advent2009-day21.t
adding integration/advent2012-day09.t
use nqp::seekfh on moar and $!PIO.seek on jvm/parrot
Naive implementation of cas()
Slightly less naive implementation of cas()

jnthn++
Update spectest.data
Merge pull request #257 from dwarring/patch-1

spectest.data changes
Add , fix open :rw
Merge pull request #264 from Nami-Doc/fix-open-rw

Add , fix open :rw
add stubbed release announcement
release, I christen thee "Echt"!
tentative list of changes in release
fix ChangeLog typo
remove .xkkv from release announcement
add note about NativeCall passing all its tests
copy NativeCall changelog entry to release announcement
I present to you the contributors

Hoopy froods, all of them.
append current release to end of release guide
[release] bump NQP revision