Add tests, connect to Travis CI

[lkastner]

• Refactored overall structure
• Add first tests
• Added basic functionality for polyhedra
• Add README.md and connection to Travis CI

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@69503a3). Click here to learn what that means. The diff coverage is 59.82%.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   60.16%           
=========================================
  Files             ?        6           
  Lines             ?      118           
  Branches          ?        0           
=========================================
  Hits              ?       71           
  Misses            ?       47           
  Partials          ?        0

Impacted Files	Coverage Δ
src/OscarPolytope.jl	100% <ø> (ø)
src/Polyhedron.jl	39.53% <39.53%> (ø)
src/helpers.jl	63.63% <63.63%> (ø)
src/HomogeneousPolyhedron.jl	76.19% <76.19%> (ø)
src/types.jl	80% <80%> (ø)
src/LinearProgram.jl	80% <80%> (ø)

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[lkastner]

Done waiting. We can always remove these commits.

[kalmarek]

thanks!