add another FullStackTest for global install

also extract some of the reused code into an base class for
fullStackTests
add GlobalUpdate test
add some cleanup to global test
use real installer for global test
add own deploy manager object for core installer
simple workaround for coreInstaller update problem
add link to Using composer correctly

 (confoo) by Igor Wiedler
add phpcs as dev dependency to experiment with it
generate a report file on phpcs execution
Update README.md
decide to commit phpcs report
fix some coding style issues
	modified:   src/MagentoHackathon/Composer/Magento/DeployManager.php
	new file:   src/MagentoHackathon/Composer/Magento/Installer/CoreInstaller.php
	renamed:    src/MagentoHackathon/Composer/Magento/Installer.php -> src/MagentoHackathon/Composer/Magento/Installer/MagentoInstallerAbstract.php
	new file:   src/MagentoHackathon/Composer/Magento/Installer/ModuleInstaller.php
	modified:   src/MagentoHackathon/Composer/Magento/Plugin.php
moved root package config operations to ProjectConfig
add own deploy manager object for core installer
simple workaround for coreInstaller update problem
get tests running again after rebase