Generalize Anchor Tags options

[neocotic]

I want to make the "Anchor Tags" section of the options page more general and applicable to links.

anchorTarget should be something like linkNew to show that templates should be instructed to render links that open in new tabs/windows where possible.

anchorTitle should be something like linkTitle to show that templates should be instructed to render links with a corresponding title where possible.

Emphasis on the "where possible" as this can be implemented by predefined and custom templates to generate any kind of markup link (HTML, Wiki, Markdown etc.), some of which don't support the functionality.

Backwards compatibility is obviously vital here and predefined templates should be updated to reflect this, again, where possible.

[neocotic]

Backup/restore developer functionality on store appears to be broken. Will have to have a look into this as it's preventing me from testing updates from previous version(s).

[neocotic]

Backup/restore will be fixed as part of #190 for convenience sake. Also, executing the following on the background page of older versions works as a good polyfiller:

(function () {
  var __store__ = window.__store__ = {};
  __store__.backup = function () {
    var obj = {}, prop;
    for (prop in localStorage) {
      if (localStorage.hasOwnProperty(prop)) {
        obj[prop] = JSON.parse(localStorage[prop]);
      }
    }
    return encodeURIComponent(JSON.stringify(obj));
  };
  __store__.clear = function () {
    localStorage.clear();
  };
  __store__.restore = function (str) {
    var obj, prop;
    obj = JSON.parse(decodeURIComponent(str));
    for (prop in obj) {
      if (obj.hasOwnProperty(prop)) {
        localStorage[prop] = JSON.stringify(obj[prop]);
      }
    }
  };
}());

Unfortunately, the JS console can sometimes truncate strings with ... meaning they can't be used to restore or the do so badly. If you do this in the background page console you can leverage Template's internal clipboard interface. For example;

ext.copy(__store__.backup(), true);

[neocotic]

These changes have been implemented as part of PR #190.

Additionally, the backup/restore developer functionality in store.coffee has been fixed.