Link to CC license pages

* Update license page template
* Add code to ExtendedTrack class to handle each license
* Add links/URLs to track templates
** (Also improve the copyright notice in the JSON API)

The pages provide the actual license terms
(Assume Version 3.0 because that was the latest when support was added)
Use Creative Commons's CC0 tool for public domain
Add missing parenthesis
html templates: use LightIRC for chat, RIP iris
Merge pull request #21 from Xe/lightirc-webchat

html templates: use LightIRC for chat, RIP iris
Merge pull request #20 from jack126guy/licenseupdate

CC license links
don't rely on pkg-config for hiredis
optional hiredis
panic on startup when unable to connect to PostgreSQL
short-circuit stats in json if hiredis isn't there
autoconf: check lfcgi and lpq
introduce include/
find EQBEATS_DIR from libeqbeats
create directory structure in EQBEATS_DIR
configure: drop useless checks

they're worth nothing if we don't use the result of the tests
generate a convenient nginx.conf
eqbeats.pc for pkg-config
connect to PostgreSQL in libeqbeats
much simpler signal handling
restore /var/lib/eqbeats as default EQBEATS_DIR

it's probably not worth risking to break anything