use a donate form with a configurable paypal id

readd paypal button id

fixed a link titled 'RSS' linking to an atom feed

Fix one spec on FF; pendingify the other until I can figure out what's going on. Seems to be different behavior of the expander plugin across chrome and FF.

Clicking 'read more' now removes the link and collapses the adjacent paragraphs. Also: hella semicolons. Fixes #2766

Remove pagination from json format of contacts#index; add explanatory comments. I KNOW. But it's super confusing and I can't find a way to rewrite the code to be more clear. Soloing FTL.

Refactor contacts#index to have explicit html and mobile formats again, because apparently infinite scroll wants the html version, not the json version.

which accepts several server misconfigurations

OpenSSL is very liberal about the order and content of the supplied
cert chain. GnuTLS however is very crucial about it. So to support
GnuTLS we need to tell our community to fix their servers (joindiaspora.com
is broken too). You can check it with
gnutls-cli -V --x506cafile=/etc/ssl/ca-certificates.crt $domain
It will print the certs in the order received and say at the end
if it could be verifed. Note that not only the order is important but
also the content. Many example configurations, especially for Nginx,
include the root cert of the CA in the chain which is wrong.
Note from a GnuTLS maintainer: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=%23573736#29

Revert "Fix federation with GnuTLS by passing the ca_file to Typhoeus"

This reverts commit 640a0181.

Refactor contacts#index specs. json requests now paginate correctly, but infinite scroll is still broken.