Add releng component for building with buckminster

This enables mirroring of the p2.site using p2 actions from buckminster
This file also contians extra dependencies needed to build the bundles in this repo
Updates bundle versions to 2.6.1
Feature version set to 2.6.1
Fixed getting the file name: don't try to remove the type if there is none
Merge pull request #3 from egonw/bugfix/myexperiment

Fixed getting the file name: don't try to remove the type if there is none
Add help pages to bin.include

Solves bug 3551
Make sure that the method removeType returns a filename
Merge pull request #9 from KlasJoenssson/2.6.1

Make sure that the method removeType returns a filename
Merge branch '2.6.1' into develop