This reverts commit 548fb984f7.

The PakBlacklist-<BuildConfiguration>.txt is used to disallow some files to be packaged in the pak file.
This can be very helpful to reduce pak file size for mobile platforms.

To avoid the user-defined blueprint class Debug.uasset located in Content/Blueprints folder to be packaged in shipping build, one has to do the following steps:
1. Create the PakBlacklist-Shipping.txt file in Build/Android directory.
2. Insert the content "../../../MyGameName/Blueprints/Debug.uasset
3. Package the game

Source: https://docs.unrealengine.com/latest/INT/Platforms/Android/ReducingAPKSize/#packageblacklist

Add built data to the gitignore.
Includes data about a map for UE4.14 that is generated when the user builds it (surprise! :D).
Often gigabytes in size.
Definitely don't want it in your repository.

as of visual studio 2015 update 2 this file stores the intellisense database.
this file is typically huge and shouldn't be included in a repository.

In addition to *.VC.opendb, *.VC.db file should be regenerated by Visual Studio automatically. So, it makes sense to ignore *.VC.db file too as it's been ignored in https://github.com/github/gitignore/blob/master/VisualStudio.gitignore

Title.

Visual Studio 2015 moved all the user specific configuration to a .vs folder, which shouldn't be tracked.

Add *.VC.opendb to the .gitignore for the UnrealEngine for Visual Studio 2015 Update 1 users. This reflects the changes in the VisualStudio.gitignore made in https://github.com/github/gitignore/pull/1778 and https://github.com/github/gitignore/pull/1783 but is more specifically targeted at solving the issue http://stackoverflow.com/questions/34319008/git-issue-with-visual-studio-2015-update-1 .

samsheff accidentally typed a few of the lines twice ^.^