Tomato setup improvements

[sertansenturk]

• Removed CustomInstaller
• Binaries are now handled correctly by both python setup.py install and python -m pip install . (Note: pip install downloads the binaries twice during installation. Not sure if it needs to be fixed.)
• long_description is read from README
• Defined extras_require (develop & demo)

[codecov]

Codecov Report

Merging #118 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##            dev   #118   +/-   ##
===================================
  Coverage   0.4%   0.4%           
===================================
  Files        46     46           
  Lines      5000   5000           
===================================
  Hits         20     20           
  Misses     4980   4980

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