Manage gems + Ruby @ current stable versions w/RVM

* update to modern, supported Ruby 2.0 version
* update gems to current versions using Bundler
* make jekyll configs confirm to current version
* switch deb package dependencies to cross-platform rvm
* ignore bundled dependencies
* some README mods as per @harding + @saivann

Gemfile.lock

@@ -0,0 +1,66 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    RedCloth (4.2.9)
+    classifier (1.3.3)
+      fast-stemmer (>= 1.0.0)
+    colorator (0.1)
+    commander (4.1.5)
+      highline (~> 1.6.11)
+    commonjs (0.2.7)
+    fast-stemmer (1.0.2)
+    ffi (1.9.3)
+    ffi-icu (0.1.2)
+      ffi (~> 1.0, >= 1.0.9)
+    highline (1.6.20)
+    jekyll (1.3.0)
+      classifier (~> 1.3)
+      colorator (~> 0.1)
+      commander (~> 4.1.3)
+      liquid (~> 2.5.2)
+      listen (~> 1.3)
+      maruku (~> 0.6.0)
+      pygments.rb (~> 0.5.0)
+      redcarpet (~> 2.3.0)
+      safe_yaml (~> 0.9.7)
+    json (1.8.1)
+    kramdown (1.3.3)
+    less (2.4.0)
+      commonjs (~> 0.2.7)
+    libv8 (3.16.14.3)
+    liquid (2.5.4)
+    listen (1.3.1)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+      rb-kqueue (>= 0.2)
+    maruku (0.6.1)
+      syntax (>= 1.0.0)
+    posix-spawn (0.3.6)
+    pygments.rb (0.5.4)
+      posix-spawn (~> 0.3.6)
+      yajl-ruby (~> 1.1.0)
+    rb-fsevent (0.9.3)
+    rb-inotify (0.9.2)
+      ffi (>= 0.5.0)
+    rb-kqueue (0.2.0)
+      ffi (>= 0.5.0)
+    redcarpet (2.3.0)
+    ref (1.0.5)
+    safe_yaml (0.9.7)
+    syntax (1.0.0)
+    therubyracer (0.12.1)
+      libv8 (~> 3.16.14.0)
+      ref
+    yajl-ruby (1.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  RedCloth
+  ffi-icu
+  jekyll
+  json
+  kramdown
+  less
+  therubyracer