Refactor BehaviorImporter spec
Refactor BehaviorImporter spec

+ Old spec was very tightly integrated with other classes like Importer and CsvTransformer
+ Made it hard to change those classes, because side effects spilled into BehaviorImporter spec
+ Boiled spec down into more of a real unit test

jhilde/studentinsights,erose/studentinsights,studentinsights/studentinsights,erose/studentinsights,studentinsights/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,erose/studentinsights,studentinsights/studentinsights,erose/studentinsights,jhilde/studentinsights,jhilde/studentinsights