update with latest converter.rb improvements

by @glebm - thx again

lib/_mixins.scss

@@ -720,11 +720,11 @@
 // [converter] Grid converted to use SASS cycles (LESS uses recursive nested mixin defs not supported by SASS)
 @mixin make-grid-columns() {
   $list: '';
-  @for $i from 1 to $grid-columns {
+  $i: 1;
+  $list: ".col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}";
+  @for $i from 2 through $grid-columns {
     $list: ".col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}, #{$list}";
   }
-  $i: $grid-columns;
-  $list: "#{$list} .col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}";
   #{$list} {
     position: relative;
     // Prevent columns from collapsing when empty
@@ -739,34 +739,34 @@
 // [converter] Grid converted to use SASS cycles (LESS uses recursive nested mixin defs not supported by SASS)
 @mixin make-grid-columns-float($class) {
   $list: '';
-  @for $i from 1 to $grid-columns {
+  $i: 1;
+  $list: ".col-#{$class}-#{$i}";
+  @for $i from 2 through $grid-columns {
     $list: ".col-#{$class}-#{$i}, #{$list}";
   }
-  $i: $grid-columns;
-  $list: "#{$list} .col-#{$class}-#{$i}";
   #{$list} {
     float: left;
   }
 }
 
 
 @mixin calc-grid($index, $class, $type) {
-  @if $type == width and $index > 0 {
+  @if ($type == width) and ($index > 0) {
     .col-#{$class}-#{$index} {
       width: percentage(($index / $grid-columns));
     }
   }
-  @if $type == push {
+  @if ($type == push) {
     .col-#{$class}-push-#{$index} {
       left: percentage(($index / $grid-columns));
     }
   }
-  @if $type == pull {
+  @if ($type == pull) {
     .col-#{$class}-pull-#{$index} {
       right: percentage(($index / $grid-columns));
     }
   }
-  @if $type == offset {
+  @if ($type == offset) {
     .col-#{$class}-offset-#{$index} {
       margin-left: percentage(($index / $grid-columns));
     }

lib/_thumbnails.scss

@@ -15,6 +15,8 @@
     margin-right: auto;
   }
 
+  // [converter] extracted a&:hover, a&:focus, a&.active to a.thumbnail:hover, a.thumbnail:focus, a.thumbnail.active
+
   // Image captions
   .caption {
     padding: $thumbnail-caption-padding;