External deployer is a deployer which starts external process
for each deployment request.
This deployer conceptually close to what what used in maven-deploy plugin
Thanks to this deployer external tools like ssh shells/scp etc. can be used
for deploying artifacts.
Such feature might be useful for users who want to relay on external security infrastructure for making deployments.
Still need to test this deployer (I haven't tried it on UNIX) and define
list of parameters passed from deployer to the external process and fix
their order.
git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@113575 13f79535-47bb-0310-9956-ffa450edef68
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