Added information about composer in installation help
Added information about composer in installation help

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