Fixes #744 incorrect site count in map on delete
Updated README
Merge branch 'master' of github.com:instedd/resourcemap into ruby-2.1.2

# By Santiago Palladino (1) and Valeria Tiffenberg (1)
# Via Santiago Palladino
* 'master' of github.com:instedd/resourcemap:
  Updated README
  Fixes #744 incorrect site count in map on delete