Don't show paid content in results.

Paid content cannot be accessed from mpsyt so they should be excluded from
search results.
Add -v flag for showing version info
Access item by url or YT video id
Separate function to generate query string.
PEP8 corrections
Updated with new changes
Changed version number to 0.01.37
Merge branch 'master' into develop
Handle errors from accessing YT url
Changed syntax for listing user uploads to 'user username'
Changed docs for listing user uploads
Added 'user' syntax change
'u <number>' to show more videos from same user
View uploads by uploader of certain item
Open YouTube playlist by URL
Added playurl and dlurl commands
Fix formatting
Updated with new changes
Added notes on new features
Implemented YT playlist search and dump command