Updated readme
Handled mathtex case where pixbufwidth=0 robustly.
Changed additional space selection

Additional space can now be added either in vertical or
horizontal directions

Signed-off-by: Wilson Brenna <wbrenna@uwaterloo.ca>
Merge branch 'master' into addpoppler
Merge branch 'addpoppler' into glib_new
Merged x2b dc5e3ba1b7ac3409a to fix #56