Dynamically generate Class-Path.
Removed Proguard references.
Remove jar references not used anymore (needed by Proguard).
Removed izpack references.
build.xml: Simplify one-jar target

Modified one-jar target to be simpler and use only ant functions without
supplementary jar needed.

(build.xml from Jérémy, I removed .gitignore from this commit)
Small modifications related to generation of javadoc and dist.
Remove tabs and ending spaces.
Include missing libraries for ant

bcpkix-jdk15on-148.jar bcprov-jdk15on-148.jar: Retrieved from
http://www.bouncycastle.org/latest_releases.html

joda-time-2.1.jar: Retrieved from joda-time-2.1-dist.tar.gz
http://sourceforge.net/projects/joda-time/files/joda-time/2.1/

openid4java-0.9.7.jar: Retrieved from
http://code.google.com/p/openid4java/downloads/detail?name=openid4java-0.9.7.720.tar.gz

xalan.jar: Retrieved from xalan-j_2_7_1-bin-2jars.tar.gz
http://archive.apache.org/dist/xml/xalan-j/binaries/
.gitignore: exclude auto-generated files
Merge pull request #14 from Lekensteyn/build-xml

Improvements to ant build process