Special case 'metawiki' prefix.

This was getting resolved incorrectly by our interwikimap hack.
See also https://gerrit.wikimedia.org/r/143769

Change-Id: I0a863e614733bad4aae3ac4e770c3e10f73da527
Update `es6-shim`, `request`, and `sqlite3` dependencies.

Change-Id: Ibd17f5918c6760f271564ba6478142a8385d317e
Don't allow version 0.0.24 of the `tmp` package.

Version 0.0.24 of the `tmp` package breaks us, because it changes the
number of arguments to a callback function.  This is because the
`promisify` API in `prfun` is unnecessarily fragile; see
https://github.com/bower/bower/pull/1403#issuecomment-48784169
for some discussion.

Change-Id: I2a2bada10798e7f73622329378280c5b81157043