Silence calls to UserController#info

[ryanfb]

Since this gets AJAX called on every papyri.info page load, it clutters up the logs with e.g.:

Jul 30, 2015 3:43:30 PM org.apache.tomcat.util.http.Cookies processCookieHeader
INFO: Cookies: Invalid cookie. Value not a token or quoted value
Started GET "/editor/user/info" for 0:0:0:0:0:0:0:1 at 2015-07-30 15:43:30 -0400
Processing by UserController#info as JSON

First two lines are from https://bz.apache.org/bugzilla/show_bug.cgi?id=52184, and should be fixed by running Tomcat 7.0.25+.

Second two lines we could look into using e.g. https://github.com/stve/silencer

[ryanfb]

Second two lines:

Started GET "/editor/user/info" for 0:0:0:0:0:0:0:1 at 2015-07-30 15:43:30 -0400
Processing by UserController#info as JSON

Are now silenced.

[ryanfb]

With #225 (Tomcat 7.0.25+ for production) done, I now only see one "Invalid cookie" log after startup, with a note that "further occurrences of Cookie errors will be logged at DEBUG level."