Make redirections to .org match with or without trailing slash and make them case-insensitive

[sj213]

The main problem with the current match expressions for redirecting to .org seems to be that they do not match if the first path component is not terminated by a slash. The regexp matching introduced by this PR should fix this behaviour. In addition, an extra match clause to catch "galaxyproject.eu/eu" has been added. All the newly introduced regexp matches are case insensitive, so "EU", "Belgium" etc are also included.

CAVEAT EMPTOR: These expressions have been constructed according to the nginx manual but are completely untested

[bgruening]

@itisAliRH let me know when you are ready and we can merge that

[sj213]

On second thought: the REs used in these rules should probably all be terminated with $. Currently, the rule redirecting /eu would also match /eutrophy and the rule matching /ifb would also match /ifbanner... Ok, these URLs are not bloody likely, but you get the idea and this is just the kind of underspecific match that is prone to bite you years later when this PR has long slipped from the group's collective memory...

Should I update this PR accordingly?

[bgruening]

Yes, please do so. Thanks!

[sj213]

Done.