ant: Updated to 1.9.2

When using 1.9.1, we get an error during the build since
we try to download
  http://www.apache.org/dist/ant/binaries/apache-ant-1.9.1-bin.tar.bz2
which isn't available any more (20130912)
proxy: New configuration parameter 'userAgent'

Added the new configuration parameter 'userAgent' to proxy.moxie.
This enables you to overwrite the HTTP header User-Agent with a custom
value for the download requests. I need this in order to bypass a corporate
web proxy allowing internet access only to Internet Explorer.
Fix download issues on Linux
Fix download issues on Linux pt2
Merge pull request #3 from uli-heller/master

Fix build issues and add a new config parameter 'userAgent' to proxy