Changes the path of log file. Urges admin to run electrum server as non root.

Till now start script was uging /var/log/electrum.log as the log file path.
That's problematic, when electrum server is launched by an unprivileged user
and without sudo. As a matter of fact there is no need to run electrum server
as root, and suggested way in electrum server's HOWTO is creating a new user.

Instead of messing with /var/log permissions or running start script with
sudo, this commit changes logging directory to user's home.

Also it urges the user to run script as non root user.
Add date and time parameters to log files
Fix log_dir path, for crontab to work
Fix for issue #57
added the possibility to change bitcoin network params to support testnet
HOWTO: Recommend bitcoind 0.9.2
Simplified the configuration to enable testnet
fix server crash due to orphaned block in header file
added networks configuration file
Banner location can be configured
Added RPC command for updating banner file
Always use current banner text
Cleanup spelling/style in HOWTO.md

Made some minor spelling and stylistic changes.
Merge pull request #70 from red-coracle/master

Cleanup spelling/style in HOWTO.md
HOWTO: fixup leveldb version required to 1.9.0
Merge pull request #63 from erasmospunk/issue61

fix server crash due to orphaned block in header file
Merge pull request #65 from slush0/master

Banner update without server restart
Merge pull request #58 from wozz/reorg

Fix for issue #57
option for poller
Merge pull request #55 from irregulator/master

Changes the path of log file. Urges admin to run electrum server as non ...
use a single logfile (easier). allow to run as root