fixes #57 and #56

[josh146]

Description of the Change: Updates the makefile to by default use a defined environment variable EIGEN_INCLUDE_DIR for the location of the eigen3 include directory. If not defined, it falls back to /usr/include/eigen3. Also removes example-f90 target from the examples makefile.

Benefits: More easily installable

Possible Drawbacks: n/a

Related GitHub Issues: Fixes #56 and #57

[codecov]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   95.27%   95.27%           
=======================================
  Files           9        9           
  Lines         656      656           
=======================================
  Hits          625      625           
  Misses         31       31

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