Merge pull request #81 from Ursadon/master

fixed LoadAverage check (Thanks to Ursadon)
improved dns-sync algorytm
added --noupdate option to skip yum update
fixes issue with crontab file permission
fixes nginx template switcher
crontab fixer
new release 0.9.8-4
Fixed sensitive record

If perform [:lower:] - user can't peroperly add some records, for example
DKIM key (which is base64 encoded crypto key)