Updating Java Enums to reflect the Betting Enums documentation

Betting Enums documentation:
https://api.developer.betfair.com/services/webapps/docs/display/1smk3cen
4v3lu3yomq5qye0ni/Betting+Enums
Merge pull request #8 from dimitrisli/master

Updating Java Enums to reflect the Betting Enums documentation