Update Freemail plugin.
Merge pull request #213 from Bombe/update-freemail-plugin

Update Freemail plugin.
Add "sign" Ant target to sign the distribution
Update FlogHelper plugin.
Update KeyUtils plugin.
Merge pull request #214 from Bombe/update-floghelper-plugin

Update FlogHelper plugin.
Merge pull request #216 from Bombe/update-keyutils-plugin

Update KeyUtils plugin.
Merge branch 'update-jstun-plugin' of github.com:Bombe/fred-staging into next

Conflicts:
	src/freenet/pluginmanager/PluginManager.java
Fix signing path
Verify jar signature
Make sign depend on package instead of dist

dist runs findbugs etc. which takes a long time. package is the default
target.
Roll back JSTUN minimum version

Due to bug #4490 connectivity-essential plugins should not have their
minimum version increased. Plugins with the essential field are not
treated differently, and the recommended version field is not used.
Update JSTUN plugin URI to v5.