Add type checking to GenericDoctrineMapper::save()
Removed composer.lock file (for now)
Add --prefer-source to composer to avoid rate limit problem
Merge pull request #4 from tomphp/development/generic-doctrine-mapper/save-argument-checks-PR

Added check to make sure the object passed is the correct type.
added GenericMapper interface
add correct namespace
Merge pull request #5 from Felix3142/feature/GenericMapperInterface

added GenericMapper interface