Added option -plugin to soot_options.xml. Added an empty
loadPluginConfiguration method to OptionsBase which is called by the
commandline parser (Options) for each specified plugin. Therefore, it
was necessary to modify make-soot-options.xsl.
 
#43
Implemented plugin load mechanism for xml files.
#43
Use return value of loadPlugin.
#43
Make use of generics.
Reverted parts of last commit that broke processing of options.
Added options to phase plugins.

#43
Make use of generics to avoid warnings.
Removed more warnings.
Removed more warnings.
Removed even more warnings.
Merge branch 'plugins' of https://github.com/bergerbd/soot into bergerbd-plugins

Conflicts:
	src/soot/Hierarchy.java