changes and fixes for post-Grasshopper 0.9.61 full compatibility. Includes:
- Grasshopper.dll is automatically added as a reference for scripting
- addition and removal of Inputs and Outputs is supported in the native Grasshopper ZUI way
- code input and out output stopped working. This is fixed
- code input and out output are now removable also via + and - ZUI signs
- several IO issues in deprecated (old) components were fixed. Also old components should keep on working properly
- GH_IO.dll deprecated iteration over chunks was removed
- registration of input parameters now via the Grasshopper SKD-suggested way
- floating editor could remain linked to a deleted component. This is fixed
several smaller improvements over previous version:
- local path is now automatically used as soon as Grasshopper file is saved to a folder
- removed text hashing
- minor code style changes
Added hint to the location where Editor is linked to
Only add Grasshopper if it is not already there
Merge pull request #51 from piac/master

changes and fixes for post-Grasshopper 0.9.61 full compatibility.
Improvements to the Upgrader. It should now work more reliably and a logic flaw was fixed
Merge branch 'master' of https://github.com/mcneel/ghpython