Topos

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- :code:`topos` is now a namespace package this means everything that was under
the `topos.*` is now under `topos.core.*`

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**Users**

- **NEW:CODE** :code:`Cartesian` and :code:`Cylindrical` classes which handle
vertex arrays in Cartesian and Cylindrical coordinates respectively.
- **NEW:DOCS** *Troubleshooting* page that attempts to detail all errors you might
encounter using :code:`topos` and what you can do to fix them.


**Contributors**

- **NEW:DOCS** :code:`showmodel` directive that will take a name, obj file and
mtl file (all optional) in insert a interactive 3D preview of the given mesh.

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Setting the release to only be on the test_travis task and python version 3.6

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Another "release" that will hopefully work this time

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This release is mainly to test the deploy: option on travis although there
have been some changes

**Added**

- Mesh class to manage and export object data
- Mesh data can be exported in .obj format
- Generators that can generate either a plane or a uncapped cylinder
- New Primitives:
+ Plane
+ Cylinder
- Started thinking about a transformation framework which makes use of the
:code:`>>` operator to support 'pipeline' operations e.g. obj >> scale >>
transform

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Initial release