Resolve #10 Feature Request: Export formats of color codes

[git-thor]

Closes #10

This PR is targetting the Python implementation.

PR #11 Provides a helper function export(name, format) for exporting the colors to different formats EXPORT_FORMATS = {"HEX", "DEC", "REL", "XML", "IPE"}

Try with:

exported = export("Egypt", "dec")
    exported = export("Egypt", "rel")

    exported = export("Egypt", "xml")
    print(exported)
    for t in exported.get("tags"):
        print(t)

Decimal DEC

{'colors': [(221, 81, 41), (15, 122, 162), (66, 178, 131), (250, 178, 85)],
 'name': 'Egypt'}

Relative [0, 1] REL

{'colors': [(0.8666666666666667, 0.3176470588235297, 0.1607843137254903),
            (0.05882352941176472, 0.48235294117647026, 0.6352941176470588),
            (0.26274509803921564, 0.6980392156862745, 0.5176470588235293),
            (0.9803921568627451, 0.6980392156862747, 0.33333333333333337)],
 'name': 'Egypt'}

XML

{'colors': [(0.8666666666666667, 0.3176470588235297, 0.1607843137254903),
            (0.05882352941176472, 0.48235294117647026, 0.6352941176470588),
            (0.26274509803921564, 0.6980392156862745, 0.5176470588235293),
            (0.9803921568627451, 0.6980392156862747, 0.33333333333333337)],
 'name': 'Egypt',
 'tags': ['<color name="Egypt-1" value="0.8666666666666667 0.3176470588235297 '
          '0.1607843137254903" />',
          '<color name="Egypt-2" value="0.05882352941176472 '
          '0.48235294117647026 0.6352941176470588" />',
          '<color name="Egypt-3" value="0.26274509803921564 0.6980392156862745 '
          '0.5176470588235293" />',
          '<color name="Egypt-4" value="0.9803921568627451 0.6980392156862747 '
          '0.33333333333333337" />']}

<color name="Egypt-1" value="0.8666666666666667 0.3176470588235297 0.1607843137254903" />
<color name="Egypt-2" value="0.05882352941176472 0.48235294117647026 0.6352941176470588" />
<color name="Egypt-3" value="0.26274509803921564 0.6980392156862745 0.5176470588235293" />
<color name="Egypt-4" value="0.9803921568627451 0.6980392156862747 0.33333333333333337" />

[git-thor]

This PR also resolves the broken README file due to missing code quote in the Python instruction.