Merged few files from "Concurrent" branch for review
Included "SetTraceDataAsyncTask.cs" project in "DynamoCore.csproj"
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into NewAsyncTasks
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into NewAsyncTasks
Added documentation for CompileCustomNodeAsyncTask class
Added documentation to "DelegateBasedAsyncTask" class
Merge pull request #2277 from Benglin/NewAsyncTasks

Implemented three new async task classes