Revert "adding entry for ignoring <solutionname>.sln.ide folder which contains visual studio 2015 solution specific cache data"

This reverts commit b07a0904e3c0714353f997b1dc6122b367dab648.

VisualStudio.gitignore

@@ -7,9 +7,6 @@
 *.userosscache
 *.sln.docstates
 
-# User-specific folders
-*.sln.ide/
-
 # Build results
 [Dd]ebug/
 [Dd]ebugPublic/