Merge pull request #171 from tmkpath/dev

Remove IntersectionPlanSet and RampMeterPlanSet from XSD and model-object
Add a type_name field to RampMeterLsdValue and RampMeterRamValue to make it easier to understand their types (numeric id wasn't enough).  Joint checkin with one on model-database-access repo.
Changes to be committed:
modified:   src/main/java/edu/berkeley/path/model_objects/scenario/RampMeterLsdValue.java
modified:   src/main/java/edu/berkeley/path/model_objects/scenario/RampMeterRamValue.java
modified:   src/main/resources/scenario.xsd