Pep8

[trichter]

This PR deals with

• applying PEP8, the elast module was spared, because I find it better readable as it is now, fixes #12, also replaced a nested loop with itertools.product
• remove conf note in utils module, it was a left-over from earlier refactoring
• moved allowed minerals and rocks to the toplevel
• add again pypi install instructions, fixes #23
• set the version number to 0.2.0-dev to reflect that the current state of code is not the same as on pypi, -dev needs to be removed before the next upload to pypi

[codecov-io]

Codecov Report

Merging #26 into master will decrease coverage by 0.21%. The diff coverage is 51.31%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
- Coverage    56.2%   55.98%   -0.22%     
==========================================
  Files           9        9              
  Lines        1137     1136       -1     
==========================================
- Hits          639      636       -3     
- Misses        498      500       +2

Impacted Files	Coverage Δ
telewavesim/doc.py	0% <ø> (ø)	:arrow_up:
telewavesim/tests/test_routines.py	100% <ø> (ø)	:arrow_up:
telewavesim/elast.py	17.9% <ø> (ø)	:arrow_up:
telewavesim/tests/test_notebooks.py	100% <ø> (ø)	:arrow_up:
telewavesim/__init__.py	100% <100%> (ø)	:arrow_up:
telewavesim/tests/test_utils.py	100% <100%> (ø)	:arrow_up:
telewavesim/wiggle.py	47.56% <36.36%> (ø)	:arrow_up:
telewavesim/utils.py	72.22% <62.14%> (-0.64%)	:arrow_down:

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