1.18.0 (April 30th 2016)

• adding URI.joinPath to compose paths from directory tokens - Issue #285
• fixing URITemplate() to allow . in variable names - PR #287
• fixing URITemplate() to reject invalid literals - PR #289
• fixing URITemplate() to reject prefix modifier on composite values - PR #290
• fixing URI.buildUserinfo() to properly serialize passwort-only values - PR #293