[partial][common] log

[at15]

Related #59

It is basic a clone of logrus with the following modification

• fatal level has lower number than painc level (reversed in logrus)
• remove all the Debug, Warn in Logger, only keep those methods on Entry
• field value can only be string, logrus use interface{}
• didn't use lock (though there is a mutex in Logger)
• does not support hook, only have filter
• does not trim \n for *f functions
• add syntax sugar to create entry with pkg i.e. logger.NewEntryWithPkg("x.tsdb.kairosdb")

the more detail description can be found in README, all the logrus usage are replaced with common/log, and since WithField is not supported, it is replaced by *f....

[arrowrowe]

Hey maybe you would like this: https://about.pullapprove.com/

always_pending:
  title_regex: 'WIP'
  explanation: 'Work in progress...'

[at15]

@arrowrowe hey maybe I should put mie on fire and brush some oil @mingo-x

[arrowrowe]

@at15 you didn't set the wip rule...

[coveralls]

Coverage increased (+1.7%) to 59.208% when pulling 1a07fe9 on common-util/log into 0674584 on master.

[coveralls]

Coverage decreased (-2.2%) to 55.316% when pulling b2bfbb3 on common-util/log into 0674584 on master.

[coveralls]

Coverage increased (+1.0%) to 58.488% when pulling 35de1ad on common-util/log into 0674584 on master.

[coveralls]

Coverage increased (+1.0%) to 58.488% when pulling 0ef0065 on common-util/log into 0674584 on master.

[coveralls]

Coverage increased (+1.5%) to 58.989% when pulling c611a4c on common-util/log into 0674584 on master.

[at15]

[at15]

LGTM

[coveralls]

Coverage increased (+1.5%) to 58.989% when pulling ddab70d on common-util/log into 0674584 on master.