Correct alias & add plugins

Aliases cannot expand variables. Have to use functions for that. In this
case it is not necessary, as the variable is at the end of the command.

Added tmuxinator & gitignore generator to the plugins.
Add new gitignore rules

Generated by gitignore.io. The file is standardized for vim, vagrant,
linux, windows and OSX.

The rest of the gitignore setup should be project dependent.
Set automatic renaming of the window title off