Adds bar graphs with cost

Gemfile.lock

@@ -15,9 +15,13 @@ GEM
     daemons (1.4.1)
     et-orbi (1.2.6)
       tzinfo
+    fiddle (1.1.0)
     fugit (1.5.2)
       et-orbi (~> 1.1, >= 1.1.8)
       raabro (~> 1.4)
+    gr-plot (0.0.1)
+      ruby-gr
+    histogram (0.2.4.1)
     i18n (1.8.11)
       concurrent-ruby (~> 1.0)
     mail (2.7.1)
@@ -29,8 +33,14 @@ GEM
     nokogiri (1.13.0)
       mini_portile2 (~> 2.7.0)
       racc (~> 1.4)
+    numo-narray (0.9.2.1)
+    pkg-config (1.4.9)
     raabro (1.4.0)
     racc (1.6.0)
+    ruby-gr (0.66.0.0)
+      fiddle
+      numo-narray
+      pkg-config
     rufus-scheduler (3.8.0)
       fugit (~> 1.1, >= 1.1.6)
     serialport (1.3.2)
@@ -44,9 +54,13 @@ PLATFORMS
 DEPENDENCIES
   activerecord
   daemons
+  gr-plot
+  histogram
   mail
   mysql2
   nokogiri
+  numo-narray
+  ruby-gr
   rufus-scheduler
   serialport
   state_pattern