Remove JobInfo hierarchy, add JobConfiguration hierarchy#584

Merged

aozarov merged 6 commits intogoogleapis:masterfrom

mziccard:bigquery-hierachies

Jan 29, 2016

Commits on Jan 26, 2016

Remove JobInfo hierarchy, add JobConfiguration hierarchy
mziccard
committed

Commits on Jan 27, 2016

Fix comments. Make JobConfiguration an abstract class
mziccard
committed

Commits on Jan 28, 2016

Commits on Jan 29, 2016

Fix access-related issues
mziccard
committed