FLUID-5458: Updated npmignore (for master)

Removed ant related files that no longer exist, also ignoring the preferences framework.

http://issues.fluidproject.org/browse/FLUID-5458
Hi jobara - can you explain why the preferences framework was removed from this image? Whilst the majority of it is view-dependent code, it includes a number of algorithms (for example, in Builder.js, AuxBuilder.js, PrimaryBuilder.js, etc.) that could indeed be useful on the server. Perhaps we should factor it a little before before we remove it entirely