Updating the maven-deploy-plugin from 2.7 to 2.8.1

2.8.1 is the version archmage uses (and it's also the latest & greatest) so let's use that

Changelog:
http://jira.codehaus.org/browse/MDEPLOY#selectedTab=com.atlassian.jira.plugin.system.project%3Achangelog-panel
Merge pull request #38 from tvaughan77/maven-deploy-plugin-upgrade

Updating the maven-deploy-plugin from 2.7 to 2.8.1