logger: added missing semicolons
check for util.inspect.colors (see also #632)
logger, 3 changes to improve testability

1. move variables to into class (testability)
2. added "return true" when methods exit normally
3. replaced a === NaN  with isNaN()
log.syslog: test improvements
tests/logger.js: added
tests/logger: pass tests on node 0.8
Merge pull request #647 from msimerson/logger

Logger