Get Active View, Save Image from View, Watch Image, Save Image File

Created 4 new nodes, not checked in yet:

- Get Active View
- Save Image from View (just wrapping the Document.ExportImage method)
- Watch Image (this was my Show CFD Results node, it was already
abstracted out to work with any image so I just renamed it)
- Save Image File, like Save [Text] File
save-as of loaded dyn file should use name from disk instead of home

see https://github.com/ikeough/Dynamo/issues/144
testing solver with just write image file
Merge branch 'master' into save-view
Merge branch 'master' into save-view
Merge branch 'master' into save-view
dynDirectory was not loading paths from dyn file

Stephen needed to implement DeserializeValue
png extension
Merge branch 'master' into save-view
image file logging
Merge branch 'master' into save-view
smooth and average nodes

- added smooth node (keeps a simple moving average from last 10 values)
to smooth out noisy values over time.
- added average node (averages list of numbers)
Merge branch 'master' into save-view
com port still locked on clear dyn or delete node
Merge branch 'master' into save-view
Merge branch 'master' into save-view
added helix mesh output to watch
Merge branch 'master' into save-view
multi-out watch3d
Merge branch 'master' into save-view