Make fields that are not meant to be modified final.
Update ServerForCreate.java

Add fields of "userData" and "availabilityZone"
[openstack-java-sdk] DownloadImage looks not worked (#27)
Merge pull request #31 from seaman25/patch-3

Update ServerForCreate.java
Merge pull request #26 from radimk/dev/swift

Make fields that are not meant to be modified final.
Merge pull request #1 from woorea/master

pull changes