Rename `demoData` folders to `example` (#435)

The Git and GitHub plugins have folders that contain small example data,
as used for tests and snapshots. These folders were called `demoData`
which is misleading since the data isn't used for demos. The folders
themselves contained files called "example", like "example-github.json"
or "exampleRepo.js". Renaming the folders to `example` is cleaner.

Test plan:
`yarn travis --full` passes.

src/v3/plugins/git/bin/createExampleRepo.js

@@ -5,7 +5,7 @@ import fs from "fs";
 import {
   createExampleRepo,
   createExampleSubmoduleRepo,
-} from "../demoData/exampleRepo";
+} from "../example/exampleRepo";
 
 function parseArgs() {
   const argv = process.argv.slice(2);

src/v3/plugins/git/createGraph.test.js

@@ -11,7 +11,7 @@ import {
 import {GraphView} from "./graphView";
 import type {Hash, Tree} from "./types";
 
-const makeData = () => cloneDeep(require("./demoData/example-git"));
+const makeData = () => cloneDeep(require("./example/example-git"));
 
 describe("plugins/git/createGraph", () => {
   describe("createGraph", () => {

src/v3/plugins/git/graphView.test.js

@@ -4,14 +4,14 @@ import cloneDeep from "lodash.clonedeep";
 
 import {EdgeAddress, Graph, NodeAddress, edgeToString} from "../../core/graph";
 import {createGraph} from "./createGraph";
-import * as exampleRepo from "./demoData/exampleRepo";
+import * as exampleRepo from "./example/exampleRepo";
 import {GraphView} from "./graphView";
 import type {Repository} from "./types";
 
 import * as GE from "./edges";
 import * as GN from "./nodes";
 
-const makeData = (): Repository => cloneDeep(require("./demoData/example-git"));
+const makeData = (): Repository => cloneDeep(require("./example/example-git"));
 const makeGraph = () => createGraph(makeData());
 const makeView = () => new GraphView(makeGraph());
 

src/v3/plugins/git/loadRepository.test.js

@@ -2,7 +2,7 @@
 
 import tmp from "tmp";
 
-import {createExampleRepo} from "./demoData/exampleRepo";
+import {createExampleRepo} from "./example/exampleRepo";
 import {loadRepository} from "./loadRepository";
 
 const cleanups: (() => void)[] = [];
@@ -25,7 +25,7 @@ describe("loadRepository", () => {
     //     src/plugins/git/loadRepositoryTest.sh --updateSnapshot
     // to update the snapshot, then inspect the resulting changes.
     expect(loadRepository(repository.path, "HEAD")).toEqual(
-      require("./demoData/example-git.json")
+      require("./example/example-git.json")
     );
   });
 

src/v3/plugins/git/loadRepositoryTest.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-data_file=src/v3/plugins/git/demoData/example-git.json
+data_file=src/v3/plugins/git/example/example-git.json
 
 usage() {
   printf 'usage: %s [-u|--updateSnapshot] [--help]\n' "$0"

src/v3/plugins/github/createGraph.test.js

@@ -8,7 +8,7 @@ import cloneDeep from "lodash.clonedeep";
 
 function exampleGraph() {
   const data: GithubResponseJSON = cloneDeep(
-    require("./demoData/example-github")
+    require("./example/example-github")
   );
   const view = new RelationalView(data);
   return createGraph(view);

src/v3/plugins/github/fetchGithubRepoTest.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-data_file=src/v3/plugins/github/demoData/example-github.json
+data_file=src/v3/plugins/github/example/example-github.json
 
 usage() {
   printf 'usage: %s [-u|--updateSnapshot] [--[no-]build] [--help]\n' "$0"

src/v3/plugins/github/graphView.test.js

@@ -12,7 +12,7 @@ import type {GithubResponseJSON} from "./graphql";
 
 function exampleView() {
   const data: GithubResponseJSON = cloneDeep(
-    require("./demoData/example-github")
+    require("./example/example-github")
   );
   const view = new RelationalView(data);
   const graph = createGraph(view);

src/v3/plugins/github/relationalView.test.js

@@ -4,7 +4,7 @@ import * as R from "./relationalView";
 import * as N from "./nodes";
 
 describe("plugins/github/relationalView", () => {
-  const data = require("./demoData/example-github");
+  const data = require("./example/example-github");
   // Sharing this state is OK because it's just a view - no mutation allowed!
   const view = new R.RelationalView(data);