Add credentialSecret to `Google.retrieveCredential`

I missed this one in 0fa591bc5.
Fix accidentally-hardcoded Twitter URL in oauth1

Fixes #2154.
Add short aliases for '--add' and '--remove' options in "meteor authorized"

Fixes #2155
Add History item for e86578e5.

Conflicts:
	History.md
Update History
Use underscore in oauth-encryption package
Update History for 1a9509
Add 0.8.1.3 section header to History
Tweak history
Revert "Add short aliases for '--add' and '--remove' options in "meteor authorized""

This reverts commit 32fc06e7f86b5f7b18226aa25d38d25af0461f9e.

As Glasser points out, our command option parsing is such that all `-a`
flags for commands have to be consistent in whether they are boolean or
not. Since we could easily imagine wanting a boolean `-a` or `-r` flag
in the future, we should be careful about adding these aliases. We'll
update the docs to remove `-a` and `-r` instead.
Remove short aliases for `meteor authorized` in help text.

Fixes #2155.
Fix IE8 minification bug

The minifier changed the two uses of HTMLTag into two different symbols:

  var n = function r() {
    var t = this instanceof e.Tag ? this : new r(), n = 0, o = arguments.length && arguments[0];
    return o && "object" == typeof o && o.constructor === Object && (t.attrs = o, n++),
    n < arguments.length && (t.children = Array.prototype.slice.call(arguments, n)),
    t;
  };
  return n.prototype = new e.Tag(), n.prototype.constructor = n, n.prototype.tagName = t,
  n;

Then, IE8 apparently actually creates two separate objects for 'n' and
'r'; see #3 at http://kiro.me/blog/nfe_dilemma.html

So just because n.prototype is an e.Tag doesn't make r.prototype a e.Tag

This means that `new r() instanceof e.Tag` is false, and so the first
line of the function leads to infinite recursion.

I'm not sure if this is an uglify bug as well; dealing well with
multiple declarations of the same function may be out of spec.

Fixes #2037.
Update History for 2db7490
Use ROOT_URL instead of Host header in spiderable
Update History, banner, notices
Update history for 107e9087
Update docs and examples to 0.8.1.3
Merge branch 'release-0.8.1.3'