logger usage

[No0b1t0]

use logger instead of console.log

[bshogol]

had an idea, we can use a program argument for the log level as well.
for example:
node app.js [inputfile] [outputfile] -log trace -> show all logging
node app.js [inputfile] [outputfile] -log info -> show only high level progress.

high level progress:

1. program starts running on file []. - 1 log
2. program progress in percent or time, just to show it runs. < 5 logs
3. program ends output file []. - 1 log

[No0b1t0]

I agree.
2 -> should display the changes in the string during the run.
very useful for debugging.