README: add shared examples in Objective-C

Fixes issue #128.
Merge pull request #147 from modocache/128-shared-examples-in-objc

README: add shared examples in Objective-C
Use vararg macros for block arguments

Otherwise, any commas _within_ the blocks will splice the argument
list, causing confusing errors.
Merge pull request #150 from github/upstream-vararg-macros

Use vararg macros for block arguments
Add section about testing UIKit interaction with Quick.
Fixes typo, accesses view instead of calling viewDidLoad directly.
Merge pull request #151 from sidraval/master

Add section about testing UIKit interaction with Quick.
QCKDSL: no 'qck_' prefix unless shorthand disabled

Users may now use Quick in Objective-C using the following syntax
(notice the lack of the `qck_` prefix):

```objc
QuickSpecBegin(DolphinSpec)

describe(@"a dolphin", ^{
  it(@"is the smartest animal in the ocean", ^{
    // ...
  });
});

QuickSpecEnd
```

To namespace the `describe`, `it`, and other macros with the `qck_`
prefix, users must `#define QUICK_DISABLE_SHORT_SYNTAX 1` before
importing the Quick header.

Addresses issue #66.
README: Use shorthand Objective-C syntax

- Use shorthand Objective-C syntax
- Add note on disabling Objective-C shorthand
- Update table of contents