Add Carthage/Build to .gitignore
Add Carthage/Build to .gitignore

When using the option `--use-submodules` with Carthage, the `Carthage/Build` directory shows in the submodule after `carthage build` making the submodule dirty.
drahot/BSImagePicker,nickfalk/BSImagePicker,drahot/BSImagePicker,mikaoj/BSImagePicker,jblorenzo/BSImagePicker,jblorenzo/BSImagePicker,mikaoj/BSImagePicker,jblorenzo/BSImagePicker,nickfalk/BSImagePicker,nickfalk/BSImagePicker