use plugin dependencies to trigger builds

[greenwoodma]

some of the plugins depend on each other, in these cases a commit should also rebuild the related plugins to check that they not only build but that the gapp loading tests still pass

[ianroberts]

Note that some of the gapp loading tests introduce dependencies that aren't obvious to Maven, for example the alignment plugin contains a gapp that loads lang-hindi, the twitter plugin contains a gapp that loads stanford-corenlp, etc.

[greenwoodma]

not sure the best way of automating this yet, but once you know this is an issue then you can add the info to the Jenkinsfile. i.e the twitter plugin should reference the corenlp plugin so it gets built and tested after any change to corenlp.

[greenwoodma]

but we should also see if we can automate the maven dependencies being build triggers as well

[greenwoodma]

we now generate the creole-dependencies.txt files which we might be able to use for this. goodness knows how though