Add Last-Modified/If-Modified-Since support #43
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[1] added support for ETag/If-None-Match to not fetch feed information unnecessarily if it didn't change since the last successful fetch.
This patch builds on top of that by reading the Last-Modified response headers and sending the values in If-Modified-Since request headers.
The goal is the same as in [1] just for situations without the ETag header.
[1] 8da1425 ("add If-None-Match etag stuff and more")