I2P release update

[grarpamp]

https://geti2p.net/en/blog/post/2016/10/17/0.9.27-Release

0.9.27 contains a number of bug fixes. The updated GMP library for
crypto acceleration, which was bundled in the 0.9.26 release for new
installs and Debian builds only, is now included in the in-network
update for 0.9.27. There are improvements in IPv6 transports, SSU peer
testing, and hidden mode.
We updated a number of plugins during I2P Summer and your router will
automatically update them after restart.
Add outproxy plugin support for SOCKS