make podspec same as https://github.com/CocoaPods/Specs/blob/master/IMAP...

This command was failed.

    pod 'IMAPClient'

But this command returns "IMAPClient"

    pod list


I think the reason is unmatched podspec between IMAPClient and [CocoaPods](https://github.com/CocoaPods/Specs/blob/master/IMAPClient/0.0.2/IMAPClient.podspec).
And after update the source file, I’ve confirmed pod install success  by following Podfile :

    platform :ios
    pod 'IMAPClient', :git => 'https://github.com/amazedkoumei/IMAPClient.git',     :commit => 'b9fc6756adeb5ee0144f97094be236cb96d90c3b'



before update, the cases of Podfile I've tried are as follows:

#### success case

    platform :ios
    pod 'imap', :git => "https://github.com/bcoe/IMAPClient.git"


#### error case1

    platform :ios
    pod 'IMAPClient'
-
"pod install" returns

    [!] Cache unable to find git reference `0.0.2' for `https://github.com/bcoe/IMAPClient.git'.

#### error case2

    platform :ios
    pod 'IMAPClient', :git => "https://github.com/bcoe/IMAPClient.git"
-
"pod install" returns

    [!] No podspec found for `IMAPClient' in from `https://github.com/bcoe/IMAPClient.git'

#### error case3
    platform :ios
    pod 'imap'
-
"pod install" returns

    [!] Unable to find a pod named `imap'