Rename breakOnUnsupportedCmds to throwOnError.

Also, the MathBb-chrome test changed, to what I believe is the correct
result? Not sure why it looked wrong before.

Test plan:
 - `make test`
 - take screenshots, see nothing changed.

test/katex-spec.js

@@ -1707,43 +1707,43 @@ describe("A MathML builder", function() {
     });
 });
 
-describe("A parser that does not break on unsupported commands", function() {
+describe("A parser that does not throw on unsupported commands", function() {
     // The parser breaks on unsupported commands unless it is explicitly
     // told not to
     var errorColor = "#933";
-    var doNotBreakSettings = new Settings({
-        breakOnUnsupportedCmds: false,
+    var noThrowSettings = new Settings({
+        throwOnError: false,
         errorColor: errorColor
     });
 
     it("should still parse on unrecognized control sequences", function() {
-        expect("\\error").toParse(doNotBreakSettings);
+        expect("\\error").toParse(noThrowSettings);
     });
 
     describe("should allow unrecognized controls sequences anywhere, including", function() {
         it("in superscripts and subscripts", function() {
-            expect("2_\\error").toBuild(doNotBreakSettings);
-            expect("3^{\\error}_\\error").toBuild(doNotBreakSettings);
-            expect("\\int\\nolimits^\\error_\\error").toBuild(doNotBreakSettings);
+            expect("2_\\error").toBuild(noThrowSettings);
+            expect("3^{\\error}_\\error").toBuild(noThrowSettings);
+            expect("\\int\\nolimits^\\error_\\error").toBuild(noThrowSettings);
         });
 
         it("in fractions", function() {
-            expect("\\frac{345}{\\error}").toBuild(doNotBreakSettings);
-            expect("\\frac\\error{\\error}").toBuild(doNotBreakSettings);
+            expect("\\frac{345}{\\error}").toBuild(noThrowSettings);
+            expect("\\frac\\error{\\error}").toBuild(noThrowSettings);
         });
 
         it("in square roots", function() {
-            expect("\\sqrt\\error").toBuild(doNotBreakSettings);
-            expect("\\sqrt{234\\error}").toBuild(doNotBreakSettings);
+            expect("\\sqrt\\error").toBuild(noThrowSettings);
+            expect("\\sqrt{234\\error}").toBuild(noThrowSettings);
         });
 
         it("in text boxes", function() {
-            expect("\\text{\\error}").toBuild(doNotBreakSettings);
+            expect("\\text{\\error}").toBuild(noThrowSettings);
         });
     });
 
     it("should produce color nodes with a color value given by errorColor", function() {
-        var parsedInput = getParsed("\\error", doNotBreakSettings);
+        var parsedInput = getParsed("\\error", noThrowSettings);
         expect(parsedInput[0].type).toBe("color");
         expect(parsedInput[0].value.color).toBe(errorColor);
     });

test/screenshotter/ss_data.js

@@ -11,7 +11,7 @@ var fs = require("fs");
 var jsyaml = require("js-yaml");
 var querystring = require("querystring");
 
-var queryKeys = ["tex", "pre", "post", "display", "doNotBreak", "errorColor"];
+var queryKeys = ["tex", "pre", "post", "display", "noThrow", "errorColor"];
 var dict = fs.readFileSync(require.resolve("./ss_data.yaml"));
 dict = jsyaml.safeLoad(dict);
 for (var key in dict) {

test/screenshotter/ss_data.yaml

@@ -106,7 +106,7 @@ SupSubOffsets: \displaystyle \int_{2+3}x f^{2+3}+3\lim_{2+3+4+5}f
 Text: \frac{a}{b}\text{c~ {ab} \ e}+fg
 UnsupportedCmds:
     tex: \err\,\frac\fracerr3\,2^\superr_\suberr\,\sqrt\sqrterr
-    doNotBreak: 1
+    noThrow: 1
     errorColor: "#dd4c4c"
 VerticalSpacing:
     pre: potato<br>blah

test/screenshotter/test.html

@@ -28,7 +28,7 @@
 
       var settings = {
           displayMode: !!query["display"],
-          breakOnUnsupportedCmds: !query["doNotBreak"]
+          throwOnError: !query["noThrow"]
       };
       if (query["errorColor"]) {
           settings.errorColor = query["errorColor"];