Make IndexConfig.create() static

[tzaeschke]

Fix for issue #35.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (15e1973) 73.61% compared to head (9d2fc6c) 73.76%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     73.61%   73.76%   +0.14%     
- Complexity     2046     2053       +7     
============================================
  Files            76       76              
  Lines          8058     8058              
  Branches       1575     1575              
============================================
+ Hits           5932     5944      +12     
+ Misses         1738     1727      -11     
+ Partials        388      387       -1     

Files	Coverage Δ
src/main/java/org/tinspin/index/IndexConfig.java	83.33% <50.00%> (+83.33%)	⬆️

... and 2 files with indirect coverage changes

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