React-Router gh-pages hosting issue

{
  "name": "Portfolio",
  "homepage": "http://martincartledge.github.io/Portfolio",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "autoprefixer": "6.5.1",
    "babel-core": "^6.21.0",
    "babel-eslint": "7.1.1",
    "babel-jest": "17.0.2",
    "babel-loader": "^6.2.10",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-react": "^6.16.0",
    "babel-preset-react-app": "^2.0.1",
    "case-sensitive-paths-webpack-plugin": "1.1.4",
    "chalk": "1.1.3",
    "connect-history-api-fallback": "1.3.0",
    "cross-spawn": "4.0.2",
    "css-loader": "^0.26.1",
    "detect-port": "1.0.1",
    "dotenv": "2.0.0",
    "eslint": "3.8.1",
    "eslint-config-react-app": "^0.5.0",
    "eslint-loader": "1.6.0",
    "eslint-plugin-flowtype": "2.21.0",
    "eslint-plugin-import": "2.0.1",
    "eslint-plugin-jsx-a11y": "2.2.3",
    "eslint-plugin-react": "6.4.1",
    "extract-text-webpack-plugin": "1.0.1",
    "file-loader": "0.9.0",
    "filesize": "3.3.0",
    "fs-extra": "0.30.0",
    "gh-pages": "^0.12.0",
    "gzip-size": "3.0.0",
    "html-webpack-plugin": "2.24.0",
    "http-proxy-middleware": "0.17.2",
    "jest": "17.0.2",
    "json-loader": "0.5.4",
    "node-sass": "^4.1.1",
    "object-assign": "4.1.0",
    "path-exists": "2.1.0",
    "postcss-loader": "1.0.0",
    "promise": "7.1.1",
    "react-dev-utils": "^0.4.2",
    "react-hot-loader": "^1.3.1",
    "react-router": "^3.0.0",
    "recursive-readdir": "2.1.0",
    "sass-loader": "^4.1.1",
    "strip-ansi": "3.0.1",
    "style-loader": "^0.13.1",
    "url-loader": "0.5.7",
    "webpack": "^1.14.0",
    "webpack-dev-server": "^1.16.2",
    "webpack-manifest-plugin": "1.1.0",
    "whatwg-fetch": "1.0.0"
  },
  "dependencies": {
    "react": "^15.4.1",
    "react-bootstrap": "^0.30.7",
    "react-dom": "^15.4.1",
    "react-router": "^3.0.0"
  },
  "scripts": {
    "start": "node scripts/start.js webpack-dev-server",
    "build": "node scripts/build.js webpack",
    "test": "node scripts/test.js --env=jsdom",
    "predeploy": "npm run build",
    "deploy": "gh-pages -d build"
  },
  "jest": {
    "collectCoverageFrom": [
      "src/**/*.{js,jsx}"
    ],
    "setupFiles": [
      "<rootDir>/config/polyfills.js"
    ],
    "testPathIgnorePatterns": [
      "<rootDir>[/\\\\](build|docs|node_modules)[/\\\\]"
    ],
    "testEnvironment": "node",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.(js|jsx)$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web"
    }
  },
  "babel": {
    "presets": [
      "react-app"
    ]
  },
  "eslintConfig": {
    "extends": "react-app"
  }
}

import React from 'react';
import { Route, Router, browserHistory } from 'react-router';

// Routes
import App from './components/App';
import Home from './components/Home';
import About from './components/About';
import Work from './components/Work';
import Contact from './components/Contact';
import NotFound from './components/NotFound';

const routes = (
  <Router history={ browserHistory }>
    <Route component={ App } >
      <Route path="/" component={ Home } />
      <Route path="about-me" component={ About } />
      <Route path="my-work" component={ Work } />
      <Route path="contact-me" component={ Contact } />
      <Route path="*" component={ NotFound } />
    </Route>
  </Router>
);

export default routes;