Merge pull request #24 from zeeke/master

Added group description for plugin tasks
Small variables refactor
DumpRemoteJenkinsItems

Added DumpRemoteJenkinsItemsTask class and relative
task in JenkinsPlugin
Added BuildDirService class to handle build directory
Added basic remote dumps test with small test fixture refactoring
Merge pull request #26 from zeeke/dump-remote-items

Dump remote items