Migrating app to Python 2.7

Python 2.7 requires a special runtime configuration element in the header of app.yaml. Note that the threadsafe: [ true | false ] element is required for Python 2.7 applications. If true, App Engine sends requests concurrently; if false, App Engine sends them serially.
Merge pull request #1 from skynet/master

Migrating app to Python 2.7