Implemented a 3d cartesian grid
Check if all vectors are in the 2D grid
Add travis-ci.org and coveralls.io support.

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Merge scalar-vector multiplication tests.

The second test had the same name as the first and so was never run.
Merge pull request #9 from Moredread/feature/travis

Add travis-ci.org and coveralls.io support.
Merge pull request #10 from Moredread/fix/merge_mult_test

Merge scalar-vector multiplication tests.
Added test for 3D grid

Check for a specific grid if all points are created correctly.
Merge pull request #7 from Moredread/feature/3d_cartesian_grid

Feature/3d cartesian grid
Merge pull request #8 from Moredread/feature/test_all_2d_vectors

Check if all vectors are in the 2D grid