abcl-asdf: Enable bypassing of loading from network if a given class already exists.
An ASDF:MVN component can now optionally specify a CLASSNAME that if able to be found in the current jvm process, inhbits further loading from the network. An ASDF:MVN component may also optionally specify an ALTERNATE-URI that will be added to the current jvm classpath if Maven cannot be invoked. Most jvm implementations won't access such jar archives from the network by default, so this is an intermediate step before actually writing the code to download the jar to the local filesystem to then be added. Refresh documentation in README.markdown.
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