Merge branch 'readability' into 'master'

Readability

This improves the overall readability of the website.

The blog needs separate work, although this update will improve readability there as well.

Fixes #73

source/_layouts/default.html

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="description" content="">
-    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,600' rel='stylesheet' type='text/css'>
+    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,600' rel='stylesheet' type='text/css'>
     <link href="/stylesheets/bootstrap.min.css" rel="stylesheet">
     <link href="/stylesheets/glyphicons.css" rel="stylesheet">
     <link href="/stylesheets/base.css" rel="stylesheet">

source/_layouts/post.html

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="description" content="">
-    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,600' rel='stylesheet' type='text/css'>
+    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,600' rel='stylesheet' type='text/css'>
     <link href="/stylesheets/bootstrap.min.css" rel="stylesheet">
     <link href="/stylesheets/glyphicons.css" rel="stylesheet">
     <link href="/stylesheets/base.css" rel="stylesheet">

source/_layouts/subscription.html

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="description" content="">
-    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,600' rel='stylesheet' type='text/css'>
+    <link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,600' rel='stylesheet' type='text/css'>
     <link href="/stylesheets/bootstrap.min.css" rel="stylesheet">
     <link href="/stylesheets/glyphicons.css" rel="stylesheet">
     <link href="/stylesheets/base.css" rel="stylesheet">

source/stylesheets/base.css

@@ -21,7 +21,7 @@ h5,
 button,
 a {
     font-family: "Open Sans", "Helvetica Neue","Helvetica",Arial,Verdana,sans-serif;
-    font-weight: 300;
+    font-weight: 400;
 }
 h2 {
   font-weight: 600;
@@ -132,7 +132,7 @@ hr.thick {
 	-moz-border-radius: 5px;
 	border-radius: 5px;
     font-size: 17px;
-    font-weight: 500;
+    font-weight: 600;
     line-height: normal;
     padding: 10px 30px;
     margin-bottom:5px;