Updated XSD and Link object to include the detail_level.  Updated the NetworkTest to handle this as a Long rather than an int.
Changes to be committed:
modified:   src/main/java/edu/berkeley/path/model_objects/network/Link.java
modified:   src/main/resources/network.xsd
modified:   src/test/java/edu/berkeley/path/model_objects/network/NetworkTest.java
Actually, make the Link detail_level an integer, not a long...

Changes to be committed:
modified:   src/main/java/edu/berkeley/path/model_objects/network/Link.java
modified:   src/main/resources/network.xsd
modified:   src/test/java/edu/berkeley/path/model_objects/network/NetworkTest.java