Merge pull request #7 from donbright/master

stl format

Author: ecumene

Cargo.lock

@@ -8,4 +8,5 @@ edition = "2018"
 nalgebra = "0.17"
 termion = "1"
 tobj = "0.1.6"
-clap = "2.32"
+clap = "2.32"
+stl_io = "0.4.2"

Cargo.toml

@@ -0,0 +1,86 @@
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+    outer loop
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+    endloop
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+    outer loop
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+    endloop
+  endfacet
+  facet normal -0.548295 0.425669 -0.719846
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+  endfacet
+  facet normal -0.548295 0.425669 -0.719846
+    outer loop
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+endsolid OpenSCAD_Model