Removed CurrencyFX
Removed M2M classes
Strip (some) Openads AdNetwork stuff
Merge branch 'master' into 35-farewell-m2m
Merge branch 'master' into 35-farewell-m2m
Started removing Adnetworks and Advertiser Signup

This means that categories, country and language are gone too
Merge branch 'master' into 35-farewell-m2m
Merge branch '35-farewell-m2m' into 59-farewell-adnetworks-advsignup
Fixed Zones test
Merge pull request #64 from openx/59-farewell-adnetworks-advsignup

Fix #59 and #35. Removed Openads Central stuff

Including all M2M, and the aborted projects AdNetworks and Advertiser Signup. As a result this also removes categories, countries and language properties from website and zones.