Merge branch 'release/3.2.0.7' into develop
Fixed sale_line.get_invoice_line to just change account for gc

For saleLine of type  giftcard, just change account rather than
overriding complete method.

Updated tests
Merge pull request #37 from tarunbhardwaj/develop

Fixed sale_line.get_invoice_line to just change account for gc
Released version 3.2.0.8
Merge branch 'release/3.2.0.8'