Add default textwidth to Javascript filetype
Add default textwidth to Javascript filetype

Since I now highlight long lines based on textwidth (commit
457a9780603ce15d45b5a53a5d06f2f842d83bf4), I added a textwidth for
Javascript buffers so I can take advantage of it.

igemnace/vim-config,igemnace/my-vim-config,igemnace/vim-config,igemnace/vim-config