Implemented issue #37 remove and purge command .

Signed-off-by: Rack Lin <racklin@gmail.com>
Merge pull request #46 from racklin/enhancement/remove_purge

Implemented issue #37 remove and purge command .
Merge pull request #47 from racklin/disable_variants

Added -variant to disable php feature.
merged disables and disable properties to disable property.

Signed-off-by: Rack Lin <racklin@gmail.com>
Merge branch 'master' into disable_variants