Update README.md

update test dependencies

Update bower.json

update screenshot code

Version 2.0.0

add styledMapType tests

add styledMapType

standardise infowindow object in scope

update to v2 and fix Error: $rootScope:infdig

"options" become a dynamic expression

reduce code

add radius into circle properties #5

check mandatories values before using it

update coverage target

avoid library to be load more than once #4