New Option: No-Skip Preview Tracks

[Miserlou]

By default, I think SoundScrape should skip the 30-second preview tracks that SoundCloud hosts now. My iTunes is now pretty polluted with previews. I'm going to need more than 30 seconds of Tenderoni, goddammit!

ex: $ soundscrape chromeo

[Miserlou]

Added in 0.26.0 as '-k'.

Skipping preview track: Bonafied Lovin (+ Tough Guys Interlude)
Skipping preview track: I Am Somebody - DJ Mehdi feat. Chromeo
Skipping preview track: Tenderoni
Skipping preview track: Rage!
Skipping preview track: You're So Gangsta
Skipping preview track: Needy Girl
Skipping preview track: Momma's Boy
Skipping preview track: Outta Sight
Skipping preview track: Waiting 4 U
Skipping preview track: My Girl Is Calling Me (A Liar)
Skipping preview track: Intro
Skipping preview track: Bonafied Lovin (Album Version)
Skipping preview track: 100% (Album Version)
Skipping preview track: Call Me Up
Skipping preview track: Opening Up
Skipping preview track: Waiting For U
Skipping preview track: Bonafied Lovin
Skipping preview track: Momma's Boy
Skipping preview track: Intro (Album Version)
Skipping preview track: Outta Sight
Skipping preview track: My Girl Is Calling Me (A Liar)