`sentiment_data.tsv` and `sentiment_test.tsv` are missing in the solution.

[joshua-light]

Issue

• What did you do?
  Opened the solution.

• What happened?
  I've found that test\data solution folder contains missing files: sentiment_data.tsv and sentiment_test.tsv.
  As it looks in Microsoft.ML.sln it has:

// Starts at 37.
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "data", "data", "{FDA2FD2C-A708-43AC-A941-4D941B0853BF}"
	ProjectSection(SolutionItems) = preProject
	>>	test\data\sentiment_data.tsv = test\data\sentiment_data.tsv
	>>	test\data\sentiment_test.tsv = test\data\sentiment_test.tsv
	EndProjectSection
EndProject

While such data actually doesn't present in repository, as it looks here.

• What did you expect?
  I'd expect that there should be no missing files in solution.

[joshua-light]

I've done something like #14cb62 because by #362 it seems like there was already a wave of non-source files removal.

Still not 100% (not even 80%) sure that I'm not wrong: maybe such data files for test should be in solution or maybe I just forgot to run some scripts (even if I tried to find sentiment_test.csv text-entries in whole repository and there were just one or two).

[TomFinley]

As in #362 my own preference would be to have files like this that don't have some immediate bearing on the project's building be omitted from the solution, since they're very hard to track. Certainly it is clear that no one has found the presence of these helpful (how could they?), nor found the absence of all other test files harmful. So what you have in your fork looks good, were you thinking of creating a PR @Joshualight ?

[joshua-light]

@TomFinley, thanks for feedback. I'll create a PR probably... right now. ))