This is a cleaner solution for issues #214 & #217.
It is now possible to go around the different copies of the earth and the source markers are updated.
When creating a source, its location is normalized with a lng value between -180 and 180
Merge branch 'dev' of https://github.com/mWater/app-v3
Merge pull request #225 from bouddhalee/master

Now possible to see the sources outside the -180 to 180 lng range