First version of program to read a CiteULike library, then search notices of
new papers and report on which papers are actually new, and which ones the
library already has in it.

This initial version
1. Reads a previously downloaded CiteULike library (from a JSON file)
2. Check an email account for new alerts.
3. But only for Web of Science alerts.

Next revision might add ScienceDirect to the mix.