Remove Sublime alias (move it to .functions)
Remove Sublime Text 2 export (unused)
Add slt(), slt-new() functions

Added a couple of functions:
- slt(): this functions opens Sublime Text 2 at the specified path. If
  there's a *.sublime-project file at that path, it opens that file;
  otherwise it normally opens the path.
- slt-new(): creates a new file at the specified path and opens it in
  Sublime Text 2