add a basic readme, license, gitignore

.gitignore

@@ -0,0 +1,4 @@
+node_modules
+tmp
+*.log
+yarn.lock

LICENSE

@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2017, Mapbox
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.

README.md

@@ -0,0 +1,6 @@
+## delaunator
+
+The fastest JavaScript library for
+[Delaunay triangulation](https://en.wikipedia.org/wiki/Delaunay_triangulation) of 2D points.
+
+A work in progress.

index.js

@@ -185,16 +185,16 @@ Delaunay.prototype = {
         var p0 = triangles[ar];
         var pr = triangles[a];
         var pl = triangles[al];
-        var p = triangles[bl];
+        var p1 = triangles[bl];
 
         var illegal = inCircle(
             coords[p0], coords[p0 + 1],
             coords[pr], coords[pr + 1],
             coords[pl], coords[pl + 1],
-            coords[p], coords[p + 1]);
+            coords[p1], coords[p1 + 1]);
 
         if (illegal) {
-            triangles[a] = p;
+            triangles[a] = p1;
             triangles[b] = p0;
 
             this._link(a, adjacent[bl]);