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GAMS Data Exchange (GDX) file access

Project Description
# PyGDX
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PyGDX is a Python package for accessing data stored in *GAMS Data eXchange* (GDX) files. GDX is a proprietary, binary file format used by the [General Algebraic Modelling System](http://www.gams.com) (GAMS); pyGDX uses the Python bindings for the [GDX API](http://www.gams.com/dd/docs/api/expert-level/gdxqdrep.html).

Originally inspired by the similar package, also named [py-gdx, by Geoff Leyland](https://github.com/geoffleyland/py-gdx), this version makes use of [xarray](http://xarray.pydata.org) to provide labelled data structures which can be easily manipulated with [NumPy](http://www.numpy.org) for calculations and plotting.

**Documentation** is available at http://pygdx.readthedocs.org, built automatically from the contents of the Github repository.

PyGDX is provided under the **MIT License** (see `LICENSE`).

Example
-------

With the following GAMS program:
````
set s 'Animals' /
a Aardvark
b Blue whale
c Chicken
d Dingo
e Elephant
f Frog
g Grasshopper
/;

set t 'Colours' /
r Red
o Orange
y Yellow
g Green
b Blue
i Indigo
v Violet
/;

set u 'Countries' /
CA Canada
US United States
CN China
JP Japan
/;

parameter p(s,t,u) 'Counts of nationalistic, colourful animals'
/ set.s.set.t.set.u 1 /;

execute_unload 'example.gdx'
````

The parameter `p` can be accessed via:
````python
>>> import gdx
>>> f = gdx.File('example.gdx')
>>> f.p[:,'y','CA']
a 1
b 1
c 1
d 1
e 1
f 1
g 1
dtype: float64
````
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