Update README

JSON does not have option since https://github.com/Alamofire/Alamofire/commit/9f7c36531d6a23ab8b5bb3f456fb7a7c79370d65
Output the URL in the cURL debug string as the value of the optional, not the optional itself
Update README.md
Merge pull request #66 from rkeniger/rob/fix-curl-url

Fix the URL written to the cURL debug string
Xcode 6 beta 7 fixes (source + iOS Example)
Merge pull request #78 from JJSaccolo/master

Xcode 6 beta 7 fixes (source + iOS Example)
Add support for progress callbacks of data requests.
JSON parameter encoding no longer has options

For now, ParameterEncoding.JSON doesn't have options anymore... this
updates the documentation to reflect that.

Fixes #86
Adding .gitignore
Adding URLStringConvertible protocol
[Issue #106] Adding macosx to SUPPORTED_PLATFORMS for framework target
gs
Auditing implicitly unwrapped optionals
Refactoring multi-conditional if statement to switch statement
Auditing implicitly unwrapped optionals
Adding Xcode Playgrounds to .gitignore
Merge pull request #93 from johngibb/patch-1

JSON parameter encoding no longer has options
Adding URLRequestConvertible protocol
Adding request method that takes URLRequestConvertible
Adding Serializer typealias and changing closure signature for serializers to omit error argument