Add zoom control doc
Add zoom control doc

rasanga/IvoryGoogleMapBundle,yappabe/IvoryGoogleMapBundle,rasanga/IvoryGoogleMapBundle,radutopala/IvoryGoogleMapBundle,radutopala/IvoryGoogleMapBundle,radutopala/IvoryGoogleMapBundle,egeloen/IvoryGoogleMapBundle,egeloen/IvoryGoogleMapBundle,yappabe/IvoryGoogleMapBundle,egeloen/IvoryGoogleMapBundle