Merge pull request #1797 from tim-hub/master

Unity.gitignore modyfying,

Unity.gitignore

@@ -2,8 +2,11 @@
 /[Tt]emp/
 /[Oo]bj/
 /[Bb]uild/
+/[Bb]uilds/
+/Assets/AssetStoreTools*
 
 # Autogenerated VS/MD solution and project files
+ExportedObj/
 *.csproj
 *.unityproj
 *.sln
@@ -13,6 +16,8 @@
 *.userprefs
 *.pidb
 *.booproj
+*.svd
+
 
 # Unity3D generated meta files
 *.pidb.meta