Raising exceptions instead of prints/returns

[prashantsengar]

In the code, we are handling the exceptions on our own in most of the cases. Example, in makeFolders we return True/False and do not raise Exceptions. This leads to the user not being able to find out the exact reason the code is not working.

We should rather raise exceptions in such cases.

But in cases like where we are downloading the files, it is better to print or add logging statements.