Remove commented out YouCompleteMe plugin
Add matchit.vim plugin
Smarter inclusion of vim-easy-align plugin
Add keymaps for vim-wasy-align
Add vim-trailing-whitespace plugin
Extract personalization into plugin/settings/

- Customization is extracted to files by topic, under plugin/settings/
- General stuff is moved to regular .vimrc
- .vimrc.after file is removed (no longer need it)
No need to set filetype for .js files

Already done by vim-javascript.