With the holidays coming, “Austin & Ally” fans have something tuneful to be thankful for. Walt Disney Records is set to release Austin & Ally: Turn It Up, a new collection of songs heard on the hit Disney Channel series.  Featuring 12 tracks performed by series’ stars Ross Lynch and Laura Marano, plus a bonus track from sisters Chloe and Halle Bailey (Season Five winners of Radio Disney’s “Next Big Thing”), the album arrives at stores and online retailers Dec.…