Update scala project dependencies.

Doing so seems to speed imports slightly; made change to avoid bug in
versions 2.1-2.3 of joda time involving performance of timezone offset
calculation (http://java-performance.com/).
Merge branch 'kkillebrew-feature-update-scala-dep' into feature/update-scala-dep
Use %% syntax
Merge pull request #276 from WorldBank-Transport/feature/update-scala-dep

Feature/update scala dep