Merge pull request #100 from mahksy/add-key-sizes

Added 2.5u and 2.75u key widths

src/key_sizes.scad

@@ -17,6 +17,10 @@ module 1_5u() {
   u(1.5) children();
 }
 
+module 1_75u(){
+  u(1.75) children();
+}
+
 module 2u() {
   u(2) children();
 }
@@ -25,6 +29,10 @@ module 2_25u() {
   u(2.25) children();
 }
 
+module 2_50u() {
+  u(2.5) children();
+}
+
 module 2_75u() {
   u(2.75) children();
 }