fix(collection): makes $fetch return $send result.
feat(serializer): makes serializer ignore explicitly mapped properties in implicit mapping process.
refactor(serializer): improves function ordering
refactor(builder): makes relations use the mapping feature when explicit url o source is given

Closes #59
refactor: changes module name to restmod

Closes #61

BREAKING CHANGES: Module name is now 'restmod'
refactor: changes service name to 'restmod' and 'restmodProvider'

Closes #4

BREAKING CHANGE: service name is now 'restmod'

Change any reference to '$restmod' to 'restmod' and '$restmodProvider' to 'restmodProvider'.