Error in the salami namespace definitions

[bmcfee]

In preparing for #128 , I noticed that the SALAMI-upper and lower regexps match [A-Z]+'*, which is intended to capture things like AAA''', but could erroneously match ABC''.

The proper way to do this is to use a backreference, eg, ([A-Z])\1*.

It's not clear that jsonschema supports PCRE backreferences though, so we might have to run this out by hand: `A+|B+|C+|...|Z+'.

[bmcfee]

Upon closer inspection, it appears that jsonschema uses the ecma-262 regex dialect, which does support back-references.