Fuefit

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* build: Untrack exclipse-project files.
* docs: Improve installation instructions and review of scientific content.
* model: Move /params/is_robust --> ./fitting/is_robust
* model: Rename fit-coefficient PMF --> BMEP.

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* core: Use `lmfit` library for enforcing limits on fitted coefficients, etc.
* data: Updated Excel file with more engines.
* docs: Fix math-formulas and improve instructions.
* WARN: ExcelRunner fails on *OS X*.

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* core: FIX calclulations.
* core: Possible to specify whether to Robust-fit or not.
* core: Pin `b0` coefficient to 0.
* excel: Enhance excel-runner code to support any python-code.
* excel: FIX parsing of ExcelRefs and their syntax documentation.
* test: Improve tests and Doctest code in README.
* test, ci: Use TravisCI/Anaconda Continuous-integration to check project health.
* docs: Add "API-reference" section.
* docs: Add some "Anaconda" help.
* NOTE: Various renames of modules, files and model properties.

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* excel: Add excel-runner for running batch of experiments.
* cmd: Rename fuefitcmd --> fuefit (back again)
* cmd: Add StartMenu item in *Windows*.
* build: Distribute on Wheels and Docs-archive.
* build: Upload to Github/RTD/PyPi.

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* Add Excel-UI.
* cmd: Rename fuefit --> fuefitcmd
* core,model: Rename rpm_XXX --> n_XXX, etc.
* docs: Update README with excel capability, copy sections from wltp project.
* build: Stop building as EXE.
* build: Add WinPython-deps as a requirments.txt.
* Add sphinx documentation.
* Relicense from AGPL --> EUPL.

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* Implemented algorithm using `pdcalc`.
* pdcalc: Implemented library that decides what to calculate with a topological sorting of
required calculations from Input --> Output, ala-Excel.
* Packaged as EXE.