Fix #203: Have org.apache.commons.lang in targets

[Bananeweizen]

The POM repositories and the Eclipse targets are somewhat out of sync.
As a quickfix just add the missing bundle to the Eclipse target. In the
long run I suggest to use a .target file in the Maven build, too,
instead of fetching whatever is available on the repository URLs.

[vorburger]

In the long run I suggest to use a .target file in the Maven build, too

or the other way around? I last did this kind of stuff about 5 ago, and forgot the details, but Oomph had these "Targlets" which, from what little I remember, were an alternative to, and better than, checked in .target files? Others may know more about this... The Oomph Wiki may even have some doc, I think I may have actually contributed some of that back at the time. I won't be able to help with this though, sorry. (And this may be best discussed in a new issue with others; closing this.)