Java SDK MVP #4

[frankgiordano]

The fourth Java SDK MVP issue will work on the following functionality mostly z/OSMF authentication services related:

• Log in to the z/OSMF server #339
• Change the z/OSMF server user password or passphrase #340
• Log out of the z/OSMF server #341
• Upgrade unirest to version 4 #342
• Token option for basic authentication #345