Option to pass separate log formats for different log levels

[dhoomakethu]

An option to override default log format for different log levels is provided.

[dhoomakethu]

@xolox I am not sure what else I need to do CI build pass, I can see all the tests are passing but the travis returns make test as fail with exit status 2. Could you guide me through as what to do ?

[coveralls]

Coverage decreased (-2.2%) to 90.408% when pulling 2e4967d on dhoomakethu:master into 9ecf560 on xolox:master.

[Dr-ZeeD]

The tests fail because your coverage is beneath 90 %.
Take a closer look at the travis output.

[coveralls]

Coverage increased (+0.3%) to 92.901% when pulling b1c9ca5 on dhoomakethu:master into 9ecf560 on xolox:master.

[dhoomakethu]

@ZeeD26 Thanks for the hints, I have fixed the coverage issue.