Update to use bengott:avatar package for all user avatars
herald integration
Add querystring updates to search

Update and parse a "?q=" query string for search to improve cross-site
linkability.
Fully abstract isAdmin

We're using a fork with a different definition of "isAdmin" (using
``meteor-roles`` rather than the boolean user.isAdmin).  ``lib/user.js``
provides abstracted methods for reading admin state, which makes it very
easy to change our definition -- except that the abstractions weren't
used universally.

This commit finishes the job of using the abstractions, and adds a few
new parts to also allow abstracting setting and updating admin-ness:

 - setAdmin: sets admin status directly on a user object.
 - updateAdmin: executes a mongo update to set admin status.
 - adminMongoQuery: the query parameter for admin-ness, for composing
   user queries with other fields.
 - notAdminMongoQuery: the query parameter for not-admin-ness.
Merge pull request #463 from AdmitHub/telescope-master-isadmin

Fully abstract isAdmin
Merge pull request #462 from AdmitHub/telescope-master-search-querystring

Add querystring updates to search
Merge pull request #454 from bengott/avatar-tweaks

Update to use bengott:avatar package for user avatars
Added Gitter badge
Upgrading to 0.9.3.1
Make it possible to hide fields from quickform; cleanup
updating packages
Update it.js
Update Kadira package to latest release 2.11.2
Update Kadira package to latest release 2.11.2
Fixing #457
Merge pull request #468 from massimilianomarini/italian-translation

Update it.js
Merge pull request #469 from massimilianomarini/kadira-package-update

Kadira package update to latest release 2.11.2
Merge pull request #466 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md
Add missing adminMongoQuery and notAdminMongoQuery

These parameters, introduced in
ed09d0ea7ce1e05f853072c9d9131d4538832019, weren't defined in that PR but
should have been.
Merge pull request #472 from AdmitHub/telescope-master-add-queries

Add missing adminMongoQuery and notAdminMongoQuery