starting spectrum.py
First Definitions of exporter
updated files
Add function write
Merge https://github.com/odarbelaeze/spectraplotpy
imported namespace spectrum in __init__.py
implemented test_construction in the test_spectrum
implemented test_copy in the test_spectrum
More addition
Merge branch 'master' of https://github.com/odarbelaeze/spectraplotpy

Conflicts:
	spectraplotpy/__init__.py
Merge branch 'master' of https://github.com/odarbelaeze/spectraplotpy
implemented mul and add in spectrum.py
modified test_copy and test_add in test_spectrum.py
Exporter passing the linter.
Merge pull request #2 from lidiabressan/master

Importer class impelemeted for Aviv files
Merge pull request #3 from mboufatah/master

I implement first lines for exporter
Merge pull request #4 from ariamania/master

added the operation of a spectrum
Merge branch 'master' of https://github.com/ariamania/spectraplotpy
Add arguments for the plot function
Add arguments to plot function