Implement chart methods

[pfouque]

I needed to use those methods which wasn't available in your module, so i did it.
BTW i'm a bit sorry about quality but this method is the only one to return array of different types and where relations are attached to a chart entity with id 0.
This time i deliver it directly with tests.

[browniebroke]

Thanks for the PR!

I'll look at it shortly. In the meantime, could you please merge/rebase my changes for coverages from the master branch? That would give more visibility on the status.

[codecov-io]

Current coverage is 97.54% (diff: 100%)

Merging #8 into master will increase coverage by 0.29%

@@             master         #8   diff @@
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  Files             4          4          
  Lines           182        204    +22   
  Methods           0          0          
  Messages          0          0          
  Branches         20         22     +2   
==========================================
+ Hits            177        199    +22   
  Misses            3          3          
  Partials          2          2          

Powered by Codecov. Last update 8896af0...eaf22ce

[pfouque]

It's done.
I also fixed code coverage by adding more tests on sub resources.
By doing so, i discovered a bug which is now fixed.

I'm not really satisfied with this implementation, especially the specific case in Client init, but as this API is really specific i didn't found another way to implement it in the actual base code without modifying core concept of your module.

So if you have another way to implement it i'm really curious to see how.

[browniebroke]

Thanks! Agree with you, but there are tests so we can improve it later if needed.