I have a file that I imported into Blender to create a basic animation to test with, then I export it to a FBX. When I import into UE4 I get a 'Could Not Find Needed track (master).
[File I import into Blender][1]
[1]: https://db.tt/nPRYqpZx
[Blender File][2]
[2]: https://db.tt/4DMw9Qkk
[UE4 Import File][3]
[3]: https://db.tt/1KM7Gxz1
how are you exporting?
I opened your blend file in blender, exported using the standard fbx export script, then imported to UE4, I got 3 warnings about the out of date fbx/one about materials(I think)/ and one about the extra bone blender adds during export, however even with the warnings the animation still played ok, I also tried to import the fbx file from your 3rd link but UE4 just closed instantly.
I found an export plugin for FBX, not sure where I found it. When I use the Blender built in FBX export, I get this:
https://dl.dropboxusercontent.com/u/59851812/UE4.png
How do I check the animation?
You can double check master_Default_Take or master_Rigid_Arm (AnimSequence) and it will open Persona.