Add DiskInfo, disk configurations and test classes#844

Merged

mziccard merged 4 commits intogoogleapis:compute-alphafrom

mziccard:compute

Apr 7, 2016

Commits on Apr 3, 2016

Add DiskInfo, disk configurations and test classes
mziccard
committed

Commits on Apr 5, 2016

Fix DiskInfo and configurations javadoc and test issues
mziccard
committed

Commits on Apr 6, 2016

Remove redundant parameter from configuration Builder constructor
mziccard
committed

Commits on Apr 7, 2016

Minor fixes to DiskInfo and configuration
mziccard
committed