make example run as tests

[felipeZ]

Changes

• Fix #27
• Move examples inside pyvotca
• Create tests for examples

[felipeZ]

@baumeier this is work in progress

[codecov[bot]]

Codecov Report

Merging #28 (45ee708) into master (f3b1131) will increase coverage by 7.83%. The diff coverage is 60.56%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   67.30%   75.14%   +7.83%     
==========================================
  Files          13       16       +3     
  Lines         471      523      +52     
  Branches       64       68       +4     
==========================================
+ Hits          317      393      +76     
+ Misses        150      124      -26     
- Partials        4        6       +2     

Impacted Files	Coverage Δ
pyvotca/examples/run_gradient.py	0.00% <0.00%> (ø)
pyvotca/visualization.py	68.42% <37.50%> (+41.14%)	:arrow_up:
pyvotca/electron_phonon.py	85.71% <80.00%> (+59.04%)	:arrow_up:
pyvotca/examples/run_energy.py	85.71% <85.71%> (ø)
...ca/examples/electron_phonon/run_electron_phonon.py	87.50% <87.50%> (ø)
pyvotca/numerical_gradient.py	31.11% <100.00%> (ø)
pyvotca/orca/orca.py	73.91% <100.00%> (+28.91%)	:arrow_up:
... and 3 more

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[felipeZ]

@baumeier @gtirimbo could you please have a look at this PR?