some cleanup
added some abbrevs to dotsettings
added builtin file category
implemented file and directory library
getimagefromview releases resources
implemented file and directory object creators
cleaned view.exportasimage
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into file-lib
remove unnecessary logic for reexecution
cleaned up dispatcher timer management
fixed no watching for directories
moved watch image node to ui library
refactored watcher nodes to use idisposable

at the request of @lukechurch
added Image.FromPixels nodes
minor fixes
updated excel read nodes to accept file objects
renamed ExportToCsv to WriteCSV
introduced CSV class
naming conventions
Refactor and rename test classes.

Make namespaces match file and directory names.
Refactor integration test base class into RevitTestServices.
Change DynamoRevitTests to RevitIntegrationTests.