Require PHPMD 2.14+, fix process call, and allow tests to run on 8.1+ #38

Job	Run time
packages_split (Amazon, task-aws)	9s
packages_split (Analyzer, task-analyzers)	12s
packages_split (ApiGen, task-apigen)	13s
packages_split (Archive, task-archives)	9s
packages_split (Coverage, task-coverage)	11s
packages_split (DbDeploy, task-dbdeploy)	12s
packages_split (FtpDeploy, task-ftpdeploy)	11s
packages_split (Git, task-git)	7s
packages_split (Hg, task-hg)	12s
packages_split (Http, task-http)	12s
packages_split (IniFile, task-inifile)	11s
packages_split (Ioncube, task-ioncube)	11s
packages_split (JsHint, task-jshint)	11s
packages_split (JsMin, task-jsmin)	8s
packages_split (Liquibase, task-liquibase)	11s
packages_split (PhkPackage, task-phkpackage)	13s
packages_split (PhpDoc, task-phpdoc)	14s
packages_split (PhpUnit, task-phpunit)	11s
packages_split (Sass, task-sass)	9s
packages_split (Smarty, task-smarty)	9s
packages_split (Ssh, task-ssh)	11s
packages_split (Svn, task-svn)	12s
packages_split (Visualizer, task-visualizer)	11s
packages_split (ZendCodeAnalyzer, task-zendcodeanalyzer)	15s
packages_split (ZendServerDeploymentTool, task-zendserverdeploymenttool)	10s
	4m 35s

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