activate lsi indexing, speed it up on OS X

Gemfile

@@ -4,4 +4,8 @@ source "https://rubygems.org"
 # gem "rails"
 gem 'jekyll', '1.5.1'
 gem 'mini_magick', '>=3.6.0'
-gem 'fileutils', '>=0.7'
+gem 'fileutils', '>=0.7'
+
+#for faster LSI generation
+gem 'narray', :git => "https://github.com/tonyarnold/narray"
+gem 'gsl', :git => "https://github.com/tonyarnold/rb-gsl"

Gemfile.lock

@@ -1,3 +1,16 @@
+GIT
+  remote: https://github.com/tonyarnold/narray
+  revision: eeb06b030320a222727e41f11a2f0be300f9dd52
+  specs:
+    narray (0.6.0.8)
+
+GIT
+  remote: https://github.com/tonyarnold/rb-gsl
+  revision: 659a95fd9b610c02e38035b956feceb5c29e1ecb
+  specs:
+    gsl (1.14.7)
+      narray (>= 0.5.9)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -55,5 +68,7 @@ PLATFORMS
 
 DEPENDENCIES
   fileutils (>= 0.7)
+  gsl!
   jekyll (= 1.5.1)
   mini_magick (>= 3.6.0)
+  narray!

Gruntfile.js

@@ -46,7 +46,8 @@ module.exports = function(grunt){
         jekyll: {
             options: {
                 src : '<%= config.src %>/',
-                config: './_config.yml'
+                config: './_config.yml',
+                lsi: true
             },
             production: {
                 options: {