- added ack
Merge branch 'master' of github.com:pharo-project/pharo-vm

Conflicts:
	README.md
Merge branch 'master' of github.com:pharo-project/pharo-vm
- minor fixes (for build with ios)
- added "external dependencies" to internal plugins, to ensure compilation in right order.
- restored iOS and iOS simulator vm build (now using makefiles instead xcodebuild).
Merge pull request #22 from estebanlm/master

iOS build restored