Update preamble._tex

Within MikTeX, in the recent version of the inconsolata package (version 1.03, released 2013-07-29) the name of the sty file was changed from 'inconsolata' to 'zi4'.

This update to the `pramble._tex` reflects this change to maintain compatibility with current version of MikTex.
Update preamble._tex

Suggested change that should handle both the new (zi4) and old (inconsolata) names of the style file associated with the `inconsolata` package. For details please refer to the comments for the previous commit.
Merge pull request #18 from marufr/patch-1

Update to preamble._tex -- 'inconsolata.sty' changed to 'zi4.sty'