starting spectrum.py
Added importer file and test_importer file.
updated files
Merge https://github.com/odarbelaeze/spectraplotpy
imported the importer in the spectraplotpy lib ( __init__.py)
defined importer class and aviv importer subclass.
defined test for aviv importer and importer.
imported namespace spectrum in __init__.py
Stylish modifications for Oscar....
implemented test_construction in the test_spectrum
Merge https://github.com/odarbelaeze/spectraplotpy

Conflicts:
	spectraplotpy/__init__.py
implemented test_copy in the test_spectrum
Merge branch 'master' of https://github.com/odarbelaeze/spectraplotpy

Conflicts:
	spectraplotpy/__init__.py
Included dataset class in import class.
Added number of data to dataset.
implemented mul and add in spectrum.py
modified test_copy and test_add in test_spectrum.py
Stylish things for Oscar.....
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