'popstate' event closes window

[ghost]

In vex.combined.js, vex.closeAll is added as listener to the popstate event:

// Close all vexes on history pop state (useful in single page apps)
window.addEventListener('popstate', vex.closeAll)

Thus, e.g. going back in history, thus activating the popstate event, runs vex.closeAll which is defined as follows:

  // Close every vex!
  closeAll: function closeAll () {
    for (var id in vexes) {
      this.close(id)
    }
    return true
  },

In this particular call of close, this is window. Thus, going back in history, may close the window.

[ghost]

I created a merge request: #213. Please merge. Should I bump the version number?

[ghost]

Nevermind, is still an issue in the lastest release (3.0.0) but it's fixed in master branch.