follow typical log-level conventions

[Joe Ibershoff]

See some examples here:

• https://github.com/nlog/nlog/wiki/Log-levels
• http://commons.apache.org/proper/commons-logging/guide.html#Message_PrioritiesLevels
• https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html

logger.log should always log, as the name indicates. logger.debug is more detailed / less important than logger.info.

[nmccready]

Thanks my bad on this.

[nmccready]

I will switch the levels to:

LEVELS =
    debug: 1
    info: 2
    warn: 3
    error: 4
    log: 5

[nmccready]

Fixed in https://github.com/nmccready/angular-simple-logger/releases/tag/0.1.0