Add more YCM keybindings and config
Add more YCM keybindings and config

- adds a keybinding for FixIt
- adds a keybinding to show the preview for the word under the cursor
- set option to start completion in tex files after 5 chars
- remove trailing whitespaces

mall0c/dotfiles,mall0c/dotfiles,mphe/dotfiles,mphe/dotfiles,mphe/dotfiles,mphe/dotfiles,mphe/dotfiles,mphe/dotfiles