Github user rgex commented on the pull request:
https://github.com/apache/incubator-usergrid/pull/300#issuecomment-119587099
From RFC 3986:
2.3. Unreserved Characters
Characters that are allowed in a URI but do not have a reserved
purpose are called unreserved. These include uppercase and lowercase
letters, decimal digits, hyphen, period, underscore, and tilde.
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
So an organisation/application/collection should only contain this
characters.
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