TRC hardfork @block 192239 / v0.8.0.2 (80002)

 - TRC build 0.8.0.2 (80002) is now the min_required build. p2pool won't
   start with an older TRC build.
 - TRC network IDENTIFIER & PREFIX values changed, so older nodes won't
   interfere anymore.
send p2p version 70002

send p2p version 70002 to work properly on new LTC daemon
Merge pull request #136 from Rav3nPL/patch-1

send p2p version to 70002 to prevent litecoind from refusing connection due to too-old version
Merge pull request #133 from terracoin/trc_hardfork_80002

TRC hardfork @block 192239 / v0.8.0.2 (80002)
added nonce to bitcoin p2p ping/pong messages to fix errors in bitcoind.log
lower maximum shares per node from 5% to 1.67% (from minimum of 10 minutes per share to 30 minutes)
added sponsors to README
require litecoin >=0.8.5.1
format durations on web pages by automatically choosing an appropriate time unit
reorganized format_dt
print RPC URL of merged mining daemon whose getauxblock call failed
terracoin blockexplorer url update.

 - cryptocoinexplorer.com now uses a separate TRC virtualhost instead of
   a different http port.
Merge pull request #143 from terracoin/blockexplorer_url_update

terracoin blockexplorer url update.
Update Makefile to use virtualenv 1.10.1
Merge pull request #144 from kevinxucs/virtualenv-1.10.1

Update Makefile to use virtualenv 1.10.1
Merge remote-tracking branch 'upstream/master' into dev

Conflicts:
	README.md