prepare for supporting python 3 and replace mechanize to requests
replace mechanize with requestes, Python 3 support
Merge remote-tracking branch 'upstream/master'
Python 3 support
robust imporvement
fix 0 byte file for srt and other small file
merge upstream
remove the warning on the retries.
removed specific mention of 2.7
Added Tkinter based wrapper GUI

No single line of core changed.
Use markdown for commands and paths
Merge pull request #111 from thekarangoel/patch-1

Use markdown for commands and paths
always respect mppl if passed
improved error msg
Merge branch 'master' of https://github.com/dgorissen/coursera-dl
catch the case when sample lectures are present and hidden
remove newline from print
Update README.md

Add one more usage instruction to remove permission problem.
Merge pull request #116 from kctong529/master

Update README.md
bug fix