Improve travis sh script and update readme

[AlaaSarhan]

No description provided.

[mariushoch]

I don't think MediaWikiCore is a very good group name for these tests (especially given it seems to be only used here, but sounds like a way more generic thing). Maybe rather chose something like TermStoreMediaWiki or TermStoreMediaWikiIntegration.

[AlaaSarhan]

@mariushoch done .. I choose TermStoreWithMediaWikiCore and avoided using Integration as to not imply that the group is only used on integration tests but also on unit ones.

[AlaaSarhan]

I was too slow to fix another issue locally .. but pushed solution to master directly now .. sorry

[JeroenDeDauw]

Great to have independent stuff \o/