Ignore eclipse files in eclipse sub-projects

The docs for eclipse Indigo still explicitly state that eclipse does not look outside project folders for `.gitignore` files. 

This sentence is missing in eclipse Luna's doc (egit v3.4.1) and it seems to work for engine and engine-test.
It does not work for modules/Core and facades/PC which makes me guess it checks one level above the project root.

Can other eclipse users confirm this? Ping @mkienenb !