Python3

[tyronerees]

Fixes #30

I have:

• changed ral_nlls_pyiface.c so that it's compatible with Python 2.7 and 3.x
• edited makebuild.sh script so that the python example is run as a test
• created a bash script in /test which follows the pattern of the other tests
• copied over the python example and tests into the build directory
• made the python install process part of the cmake build, so that the python module is built automatically. This now generates (and runs) a build-dependent setup.py
• edited the travis files so that python/numpy are installed prior to a build

[codecov-io]

Codecov Report

Merging #35 into master will increase coverage by 3.24%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
+ Coverage   84.41%   87.65%   +3.24%     
==========================================
  Files           4        4              
  Lines        2566     3354     +788     
==========================================
+ Hits         2166     2940     +774     
- Misses        400      414      +14

Impacted Files	Coverage Δ
libRALFit/src/ral_nlls_internal.f90	88.3% <0%> (+3.19%)	:arrow_up:
libRALFit/src/ral_nlls_workspaces.f90	84.93% <0%> (+5.9%)	:arrow_up:

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[tyronerees]

Just so it's documented, as a source for porting the extension to Python 3 I used: https://docs.python.org/3/howto/cporting.html

For building via distutils and cmake I followed the advice here: https://bloerg.net/2012/11/10/cmake-and-distutils.html