Merged James Willis requested to merge documentation into master

A documentation section has been created using Read The Docs and is found in "/doc/RTD". In order to create the documentation Sphinx v1.3.1 was used. To create the html file use:

make html

which creates "index.html" in "_build/html/".

An initial design layout has been created and initial drafts of the Task-Based Parallelism and Hierarchical Cell Decomposition have been completed and need inclusion in the master branch.

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