Adding repository to package.json

[pdehaan]

Now the repo URL and stuff will show up in npmjs.org and npm bugs eslint-tester should work.

[pdehaan]

FWIW, here was the output from my npm install and npm outdated:

$ git clone https://github.com/eslint/eslint-tester.git .

$ npm install
npm WARN package.json eslint-tester@0.2.0 No repository field.

$ npm shrinkwrap --dev
wrote npm-shrinkwrap.json

$ # sudo npm i nsp -g
$ nsp audit-shrinkwrap
No vulnerable modules found

$ npm outdated --depth 0
Package   Current  Wanted  Latest  Location
chai        1.8.1   1.8.1   1.9.1  chai
istanbul   0.2.16  0.2.16   0.3.2  istanbul
mocha      1.17.1  1.17.1  1.21.4  mocha
rewire      2.0.1   2.0.1   2.1.0  rewire
shelljs     0.2.6   0.2.6   0.3.0  shelljs

$ travis-lint # http://lint.travis-ci.org/eslint/eslint-tester

$ # sudo npm i pjv -g
$ pjv -wr
package.json is NOT valid
{ valid: false,
  errors: [ 'Invalid version range for dependency eslint: latest' ],
  warnings:
   [ 'Missing recommended field: bugs',
     'Missing recommended field: contributors',
     'Missing recommended field: repository' ],
  recommendations: [ 'Missing optional field: homepage' ] }