Add *~ to .gitignore and newline at EOF
correct name of __init__.py

This file is needed to recognize speclens as a package. Previous
(incorrect) filename was __init.py__
Update oupdate output paths in makeplots.py. Fixes #1

makeplots.py imports speclens using a relative path,
output data and plot dirs are now set to data/ and plots/
subdirs within top-level dir.

.gitignore will ignore these directories