Added importer file and test_importer file.
imported the importer in the spectraplotpy lib ( __init__.py)
defined importer class and aviv importer subclass.
defined test for aviv importer and importer.
Stylish modifications for Oscar....
Merge https://github.com/odarbelaeze/spectraplotpy

Conflicts:
	spectraplotpy/__init__.py
Included dataset class in import class.
Added number of data to dataset.
Stylish things for Oscar.....
Merge pull request #2 from lidiabressan/master

Importer class impelemeted for Aviv files