v0.8.3

Fixes:

• grid-template-columns (@gKreator, @Cerdic)
• self in selector and parse improvements (@designerno1, @Cerdic)
• invalid css output when using interpolation with mixins (@Jasonkoolman, @Cerdic)
• parser error for @each $selector in & {...) (@wesleyvicthor, @Cerdic)
• @extend in extended class or placeholder, doesn't produce extended selector (@dimitrov-adrian, @Cerdic)
• weird @extend behavior (@Kenneth-KT, @Cerdic)
• nested selector issue (ruby vs libsass difference) (@designerno1, @Cerdic)
• pscss exhausts memory (@gsmith-daed, @Cerdic)
• infinite loop compiling mixin with nested @content (@exigon, @Cerdic)
• nested media queries error (@arnoschaefer, @Cerdic)
• set upper bound for php version requirement (@staabm)
• "crunched" formatter features (@Daijobou, @Cerdic)
• line comments for @media statements (@gajcapuder, @Cerdic)
• failed interpolation in placeholder (@GuidoJansen, @Cerdic)
• parentheses in selector causes loss of whitespace (@Netmosfera, @Cerdic)