Adding homepage and bugs links to package.json

Note, this still throws warnings on http://package-json-validator.com/ saying that "latest" isnt semver-ey:
```json
{
  "valid": false,
  "errors": [
    "Invalid version range for dependency eslint-tester: latest"
  ],
  "warnings": [
    "Missing recommended field: contributors"
  ],
  "recommendations": [
    "Missing optional field: engines"
  ]
}
```
Merge pull request #739 from pdehaan/patch-4

Adding homepage and bugs links to package.json