enabling threadsafe element in appengine-web.xml

setting threadsafe to true is required to make it work with latest
version of GAE.
Merge pull request #32 from floatingmonkey/master

enabling threadsafe in appengine-web.xml
Update to SDK 1.7.0
appengine-tools-sdk upgraded 1.7.0
datanucleus-appengin updated to 2.0.1.1
[maven-release-plugin] prepare release 0.9.4
[maven-release-plugin] prepare for next development iteration
Merge pull request #33 from jbroberg/master

Update to SDK 1.7.0
Moving the changelog here.
fixed typo
Merge pull request #40 from wasserfuhr/patch-1

fixed typo
Fix formatting and update version
Merge pull request #42 from ariofrio/patch-1

Fix formatting and update version
Update to SDK 1.7.1
Merge pull request #46 from jbroberg/master

Update some packages to SDK 1.7.1
Going with datanucleus v1 as default
Updated gae.version to 1.7.1
Merge branch 'master' of github.com:maven-gae-plugin/maven-gae-plugin
Update to SDK 1.7.2
Merge pull request #48 from jbroberg/master

Update the SDK to 1.7.2
update GAE SDK 1.7.{2=>3}