Add functional methods for images and Image class#826

Merged

aozarov merged 2 commits intogoogleapis:compute-alphafrom mziccard:compute-image

Apr 2, 2016

+1,247-8

Commits on Mar 31, 2016

Add functional methods for images and Image class
mziccard
committed

Commits on Apr 1, 2016

Fix image's delete and deprecate methods, document image's list and update tests
mziccard
committed