User changed symbolic link for sublime binary is now top priority,
since this allows users to actually specify which version of sublime
they want to use. Sublime text 2 binary has higher priority over
sublime text (3) binary, since sublime text 2 is considered more
stable.
Detects the platform using "uname", and sets the alias accordingly.
If you are using Linux, this assumes that you have created a
symbolic link to /usr/bin/sublime_text.