Maintains a list of used (locked) ports

Functionality for locking/unlocking ports when they are open or closed.

The list of available ports will not present those who are locked.
Removed some files that got mixed up from the Makers branch
Included the win32 .iss installer builder
started working on #22, menu and submenu are there, running out of battery now, I'll finish this up later today
Merge branch 'master' of https://github.com/edutec/Snap4Arduino

Merge upstream