enable log_loading_errors option

[uladkasach]

currently when we attempt to load a file and it does not exist (404 error) then the iframe that finds the http error sends a console.error message. This is not desirable in some settings, such as

• determining whether a path refers to a directory (and we should load index.js) or it refers to a file (and we should simply append .js to the end) handle path links to directories (where dir/index.js is expected) #11
• when we do not know whether the file will exist but wish to process it if it does

It is possible to simply replace the console.error function with something that does nothing while loading these files.

We do not want to make this a default setting, however, because it would increase difficulty in debugging errors. So, make this an optional paramters.

e.g., {log_loading_errors : false}

[uladkasach]

We can not catch the error due to : JakeChampion/fetch#155

And we can not simply set the console.error function in the iframe to a non responsive function because apparently the console.error function of the iframe is not used.

Until new information / ideas are found, this will not be implemented.