Merge pull request #1388 from elerch/patch-1

add *.vs/ to ignore VS files in VS15 CTP5

VisualStudio.gitignore

@@ -22,8 +22,8 @@ bld/
 [Bb]in/
 [Oo]bj/
 
-# Roslyn cache directories
-*.ide/
+# Visual Studo 2015 cache/options directory
+.vs/
 
 # MSTest test Results
 [Tt]est[Rr]esult*/