remix-debug depends on web3
remix-debug depends on web3

remix-debug has the following line in `src/cmdline/index.js`:
```
var Web3 = require('web3')

<... snip ...>

  connect (providerType, url) {
    if (providerType !== 'http') throw new Error('unsupported provider type')
    this.web3 = new Web3(new Web3.providers.HttpProvider(url))
  }

```

So it should either mark `web3` as a dependency in `package.json` or
refactor `remix-lib` to provide a web3 provider that can take an
`url` paramter.

This patch does the former and makes `remix-debug` depend on the same
version of `web3` as `remix-lib` in `package.json`.

ethereum/remix,ethereum/remix,ethereum/remix,ethereum/remix,ethereum/remix