First version of Calypso Stats

The UI still need to be refined, but major features are all there. 
We want to start testing new Stats for real asap, and meanwhile refine stats UI with smaller PRs.
The reason this is necessary is because of [this line](https://github.com/wordpress-mobile/WordPress-Android/blob/feature/calypso-stats/WordPress/src/main/java/org/wordpress/android/ui/stats/StatsViewHolder.java#L29) which sets the movement method for the textView, causing it to intercept clicks.

I think you can get rid of the `setEntryTextViewClickListener()` hack by setting the movement method in `setEntryTextOrLink()` instead, like this:
```
public void setEntryTextOrLink(String linkUrl, String linkName) {
        if (entryTextView == null) {
            return;
        }
        boolean isLink;
        if (TextUtils.isEmpty(linkUrl)) {
            entryTextView.setText(linkName);
            isLink = (linkName != null && linkName.startsWith("http"));
        } else if (TextUtils.isEmpty(linkName)) {
            entryTextView.setText(linkUrl);
            isLink = (linkUrl != null && linkUrl.startsWith("http"));
        } else {
            entryTextView.setText(Html.fromHtml("<a href=\"" + linkUrl + "\">" + linkName + "</a>"));
            isLink = true;
        }

        if (isLink) {
            entryTextView.setMovementMethod(StatsWPLinkMovementMethod.getInstance());
            Linkify.addLinks(entryTextView, Linkify.WEB_URLS);
            StatsUIHelper.removeUnderlines((Spannable) entryTextView.getText());
        }
    }
```