Refactor filesystem, Drush, shell utilities.
Fix drush aliases writability check
Convert Drush class to a console helper
Start automated tests
Test FilesystemHelper.
Use the Symfony Filesystem component
Fix name of DrushHelper file
Add --force-symlinks option to platform build.
Test ShellHelper
Remove check for is_dir in symlinkDir, and hide makePathRelative.
Remove old import
Use the Symfony Process component.
Clarify build errors after get.
Keeping up-to-date
Don't delete the _local alias just because the www symlink no longer points to a build.
Symfony Filesystem::symlink() only works with directories.
Always copy if there is no symlink() function, and always use absolute paths on Windows.
Test shell with a command that will work on Windows too.
Fix shell test.
Merge pull request #157 from pjcdawkins/refactoring

Refactor filesystem, Drush, shell utilities