The `ShareKit/GooglePlus` subspec `pod lib lint` is [broken](https://travis-ci.org/rivera-ernesto/ShareKit/builds/24164009#L509) since d4403c084142573992cc4027e6e59ffeb2f89473.

```
$ pod lib lint --subspec=ShareKit/GooglePlus
 -> ShareKit/GooglePlus (2.5.7)
    - ERROR | [iOS] [ShareKit/GooglePlus] [xcodebuild]  /Users/travis/build/rivera-ernesto/ShareKit/Classes/ShareKit/Sharers/Services/Google Plus/SHKGooglePlus.m:14:9: fatal error: 'GTLPlusPerson.h' file not found
[!] ShareKit did not pass validation.
You can use the `--no-clean` option to inspect any issue.
The command "pod lib lint --subspec=ShareKit/GooglePlus" exited with 1.
$ xctool -project 'ShareKit.xcodeproj' -scheme 'Static Library' -configuration Release -sdk iphonesimulator -arch i386 build
[Info] Loading settings for scheme 'Static Library' ... (1148 ms)
```