Improve warn or deprecated message in v1 code

[Yang-33]

Resolve #353

TODOs

• add warn ... for all functions & check if destination is correct
  • I used https://gist.github.com/Yang-33/833011e6adcced62bf893e44cdeb9993 to check this. destination is checked by my eye..
• add @deprecated .... with message for all functions
  • I used https://gist.github.com/Yang-33/341547bbd031ce22152163077636edc6 to insert comment, though script itself is a little bit wrong. I fixed comment in client.rb after running the script.
• add @deprecated .... for all classes

[mokuzon]

Awesome!