TestFlightSDK change https to http due to a unverified ssl identity

I think that an unverified ssl identity is causing curl to get angry.

[31m[!] Pod::Executable -L -o '../Pods/TestFlightSDK/file.zip' 'https://d3fqheiq7nlyrx.cloudfront.net/sdk-downloads/TestFlightSDK1.3.0-beta.2.zip'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
 86 1226k   86 1056k    0     0  2083k      0 --:--:-- --:--:-- --:--:-- 2301k
		curl: (56) SSL read: error:00000000:lib(0):func(0):reason(0), errno 54

![testflight](https://f.cloud.github.com/assets/386473/353270/d7c3091e-a07c-11e2-85f1-f9f3b2089928.png)