Empty __browserfs_test__ indexedDB database is not deleted

[jcubic]

If you use browserFS you end up with two indexedDB databases one is empty and it looks like debug code.
It's because of the code that tests if indexedDB is supported:

  public static isAvailable(): boolean {
    // In Safari's private browsing mode, indexedDB.open returns NULL.
    // In Firefox, it throws an exception.
    // In Chrome, it "just works", and clears the database when you leave the page.
    // Untested: Opera, IE.
    try {
      return typeof indexedDB !== 'undefined' && null !== indexedDB.open("__browserfs_test__");
    } catch (e) {
      return false;
    }
  }

The library should clean up after itself.

[james-pre]

@jcubic Is this error still around? If so I can take a look at having BrowserFS clean it up after checking that IndexedDB works.

[jcubic]

I will test if the debug database is still there. I will need to check the latest version, will try when I found some free time, maybe on the weekend.

[james-pre]

Please use zen-fs/core#21