populate the stub for line-up, matrix, spiral-matrix, triangle (#80)

Author: glennj

exercises/practice/line-up/line_up.moon

@@ -0,0 +1,4 @@
+{
+  format: (name, number) ->
+    error 'Implement me'
+}

exercises/practice/matrix/matrix.moon

@@ -0,0 +1,7 @@
+{
+  row: (str, idx) ->
+    error 'Implement me'
+
+  column: (str, idx) ->
+    error 'Implement me'
+}

exercises/practice/spiral-matrix/spiral_matrix.moon

@@ -0,0 +1,4 @@
+{
+  spiral_matrix: (size) ->
+    error 'Implement me'
+}

exercises/practice/triangle/triangle.moon

@@ -0,0 +1,10 @@
+is_equilateral = (a, b, c) ->
+  error 'Implement me'
+
+is_isosceles = (a, b, c) ->
+  error 'Implement me'
+
+is_scalene = (a, b, c) ->
+  error 'Implement me'
+
+{ :is_equilateral, :is_isosceles, :is_scalene }