Ignore .pyc files

Hello,

I tested your software with the data set provided and it looks very good!

I do not know if you add the `.pyc` files on purpose or not but I think is better not include them in the repository. Said that, I made a commit removing all `.pyc` files at the main folder and the `tools` folder. I have added a `.gitignore` file to ensure do not keep track of this type of files in the future.

Feel free to merge or discard this PR.