Adding key/value style config file

Keys for Linode's API key, domain name, ip cache file location,
and the name of the sub-domain
Caching IP for Check

Fixed config.ini file key to uppercase for IP_CACHE. Instituded
a caching check to determine if the IP has changed before
updating Linode. Could be placed in cron.hourly or cron.daily.
Merge branch 'development'

Conflicts:
	linodeDynDns.pl