Handle case-insensitive comparison of diacritics

NodeJS and Postgres differ in how they treat characters like diacritics
when lowercasing so we should always lowercase both sides of our
equality check in the same language.

An example to illustrate the differences:

```
+-------------+------------------------------+----------------+
| Environment | Operation                    | Result         |
+-------------+------------------------------+----------------+
| Postgres    | lower('BOGOTÁ, D.C.')        | 'bogotÁ, d.c.' |
| NodeJS      | 'BOGOTÁ, D.C.'.toLowerCase() | 'bogotá, d.c.' |
+-------------+------------------------------+----------------+
```

Author: c-w

services/features.js

@@ -159,7 +159,7 @@ function getByName(query, callback) {
     const names = query.name.constructor === Array ? query.name : [query.name];
 
     let namesDisjunction = `(${names.map(function(name) {
-        return `lower(name) = ${escapeSql(name.toLowerCase())}`;
+        return `lower(name) = lower(${escapeSql(name)})`;
     }).join(" OR ")})`;
     let nameQuery = `SELECT ${buildQueryColumns(query)} FROM features WHERE ${namesDisjunction}`;