Support PKCS#12 cert stores in PharPackageTask.

Allow a PKCS#12 certicate store to be used instead of a regular PEM-encoded
private key in the <pharpackage> task.
Usage is similar to that of private keys, with the "keypassword" attribute
being used as the store's passphrase.
Added missing attribute to UpToDateTask documentation
Merge pull request #231 from omnicolor/master

Added missing attribute to UpToDateTask documentation
Merge pull request #229 from fpoirotte/pkcs12

Support PKCS#12 cert stores in PharPackageTask.
Merge pull request #230 from johan162/master

Updated documentation for DocBook5
Add additional phpunit configuration (disables backupGlobals etc)
Add missing attributes for pharpackage task
Update output targets
Don't install xdebug
Fixes #1037 - close filterchain element
Fixes #1036 - use command variable for passthru() call