Add a note about building on Tails with < 1GB of RAM.
Merge branch 'master' of https://github.com/agl/pond
Fix nil-pointer defer in the case of an HTTP error from the PANDA server.
Reduce the reordering limit.

The old value (2048) was just a sanity check against storing a huge
number of keys for missing messages, but was still very large. This
seems like a more reasonable number.
Merge branch 'master' of https://github.com/agl/pond