Uploading MiniEdit 2.1.0.7.1

Many changes since master version.
- save/load topologies
- host, controller, switch and link properties
- link actions to set status up/down
Update to 2.1.0.8
Update to 2.1.0.8.1.  Include a fix to work around Mininet version number
checking with non-numeric characters.
Merge pull request #257 from ggee/miniedit21071

 Uploading MiniEdit 2.1.0.7.1