Add instructions for reporting bugs that are useful.
Rewrap long lines in the readme file.
Fix (sub-)bullets that were broken by a previous commit.
Reword the documentation slightly.
removed reference to cookies
Added -k option to curl command
Fixes curl failing trying to verify coursera certificate
Added netrc path as user option
Use --netrc with path. If no path is given or --n, -c and -u are omitted
a default netrc path is tried ($HOME/.netrc on *nix* or
%USERPROFILE%\_netrc on windows).
Print bandwidth in addition to the number of downloaded bytes.
Changed logging level for several log messages
- changed logging of resource urls from info to debug
- added 'downloading' and 'already downloaded' info messages
Changed logging formats to some more readable format

- Debug format: levelname[funcname]: message
- Error format: levelname: message
- Info format: message
Curl output now as progress bar incl. percentage done
added longer class name to readme examples
Merge pull request #56 from thomasballinger/readme-long-coursename-example

add longer class name to readme examples
Merge pull request #53 from sdbakker/master

* Unify the handling of netrc files.
* Adjust the log level of some messages.
* Prettify curl's output.
Merge pull request #55 from igors/bandwidth

Print bandwidth in addition to the number of downloaded bytes.
test: Add example of a preview page.
Move all classes definitions to be together.
Add declaration of encoding.
Reorder imports to follow PEP-8.
Remove misleading or redundant comments.