- fix a problem with branch when pulling

I've added branch in podspec to correct a bug when using JFELocationManager in a PodFile


```
⌘ pod install
Analyzing dependencies
[!] Pod::Executable pull

From https://github.com/CocoaPods/Specs

   126d448..3a51f25  master     -> origin/master

There is no tracking information for the current branch.

Please specify which branch you want to merge with.

See git-pull(1) for details



    git pull <remote> <branch>



If you wish to set tracking information for this branch you can do so with:



    git branch --set-upstream-to=<remote>/<branch> fork
```