Fix examples and start testing them

[adam-urbanczyk]

Will resolve #601

[codecov]

Codecov Report

Merging #609 (c19a024) into master (68bac66) will decrease coverage by 0.40%.
The diff coverage is 89.74%.

@@            Coverage Diff             @@
##           master     #609      +/-   ##
==========================================
- Coverage   94.25%   93.84%   -0.41%     
==========================================
  Files          29       31       +2     
  Lines        6366     6447      +81     
  Branches      679      691      +12     
==========================================
+ Hits         6000     6050      +50     
- Misses        227      258      +31     
  Partials      139      139              

Impacted Files	Coverage Δ
tests/test_examples.py	89.74% <89.74%> (ø)
cadquery/cq_directive.py	30.95% <0.00%> (ø)
cadquery/cq.py	89.38% <0.00%> (+0.10%)	⬆️
cadquery/cqgi.py	81.40% <0.00%> (+0.41%)	⬆️

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[marcus7070]

I love that you're using the examples as tests now, that's a great improvement.

[adam-urbanczyk]

I'll try to add testing of the examples in the docs too. Should be possible with docutils and a custom implementation of the cq_directive it seems.

https://gist.github.com/mastbaum/2655700

[jmwright]

@adam-urbanczyk Looks good, thanks for doing this. All the tests run fine on my local machine as well.