Changes to loading and saving

[johnflavin]

Fix for #154 and #464.

Load and Create

Previously, the various DockerClient.load(...) methods all wrapped the /images/create docker API endpoint, not the /images/load endpoint as the method name implies. In fact, no methods in DockerClient wrapped /images/load.

This PR:

• Deprecates all existing DockerClient.load(...) methods;
• Creates two DockerClient.create(...) methods, the implementations of which perform the functions that DefaultDockerClient.load(...) used to perform;
• Creates a new DockerClient.load(ImageStream) method, the implementation of which calls /images/load.

Save

• There was no reason to use the AuthConfig when calling /images/{name}/get. The method DockerClient.save(String, AuthConfig) has been deprecated.
• The other save method, DockerClient.save(String) has been changed to DockerClient.save(String...). This is to make use of the two related APIs /images/{name}/get and /images/get?names=name1&names=name2....

[codecov-io]

Current coverage is 51.58%

Merging #472 into master will increase coverage by 0.15%

@@             master       #472   diff @@
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  Files            80         80          
  Lines          2973       2989    +16   
  Methods           0          0          
  Messages          0          0          
  Branches        417        421     +4   
==========================================
+ Hits           1529       1542    +13   
- Misses         1308       1310     +2   
- Partials        136        137     +1   

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[davidxia]

Rebased here #494