[MRG] DOC Update README

[glemaitre]

Reference Issue

Fixes #276

What does this implement/fix? Explain your changes.

Any other comments?

[codecov]

Codecov Report

Merging #278 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #278   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files          58       58           
  Lines        3427     3427           
=======================================
  Hits         3368     3368           
  Misses         59       59

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[glemaitre]

@chkoar I let the references table. Remaining at the end of the README, I don't find it so much intrusive and it could be useful for quick search without going in the doc.

[chkoar]

Thanks for the ping. Test, Development and About shouldn't be in the upper level?