libsass 0.7.0

Anthony Sottile contributed to the most of this release. Huge thanks to him!

• Follow up the libsass upstream: 3.1.0 — See the release note of Libsass. [#38, #43 by Anthony Sottile]
  • Custom functions and imports
  • Decrementing in @for loops
  • @debug and @error
  • not operator
  • nth() for maps
  • inspect()
  • feature-exists()
  • unique-id()
  • random()
• Added custom functions support. [#13, #44 by Anthony Sottile]
  • Added sass.SassFunction class.
  • Added custom_functions parameter to sass.compile() function.
  • Added data types for custom functions:
    • sass.SassNumber
    • sass.SassColor
    • sass.SassList
    • sass.SassMap
    • sass.SassError
    • sass.SassWarning
• Added precision parameter to sass.compile() function. [#39 by Andrea Stagi]
• sassc has a new -p/--precision option. [#39 by Andrea Stagi]