Minor coding style changes and typo fixes

1. Switched to BASH Arithmetic expressions for some if statements that used numbers.
2. Added ${var} as best practice
3. Minor spelling fixes
trying to fix few glitches I commented on https://github.com/arkhebuz/datawatch/pull/1
Changing right to eight in comments
DNS servers array fix (again)
Heh,  ->  (works anyway)
Bugfix - exit when primeminer is already running
Datacointalk link