Files in nodes_modules must be ignored when scanning current folder

[gravis]

If no files are passed to toolbelt as param, the current folder and subfolders will be scanned:

gemnasium dependency_files push 
[warning] No files given, scanning current directory instead. 
[...]

We must exclude node_modules folders, as they will contains a lot of package.json files, and it will mess up the project on Gemnasium. This folder is used to install packages files locally: https://docs.npmjs.com/files/folders#node-modules

[gravis]

We must also exclude .bundle folders