Have spaces on empty for iterator pads
#19 Map into existing instances.
- Either defined explicitly with @MappingTarget, or implicitly as last parameter in a void method.
#19 Simplifying creation of MappingMethod objects
Merge branch 'agudian_19'

# By Andreas Gudian (2) and Gunnar Morling (1)
* agudian_19:
  #19 Simplifying creation of MappingMethod objects
  #19 Map into existing instances. - Either defined explicitly with @MappingTarget, or implicitly as last parameter in a void method.
  Have spaces on empty for iterator pads
#19 Adding template for Parameter, simplifying PropertyMapping by passing source and target bean via template
#19 Requiring @MappingTarget annotation for target parameters for the sake of readability/explicitness; Improving test method names