Refactored social authentication service property to be set by overridable method call instead of clumsy String class name reference.
Refactored social authentication service property to be set by overridable method call instead of clumsy and non-typesafe String name reference.
Merge pull request #70 from habuma/master

Refactored social authentication service property to be set by overridable method call instead of clumsy and non-typesafe String name reference.