Code review comment for lp:~macslow/notify-osd/fix-fractional-point-size

This branch fixes extracting a fonts point-size with a fractional part and thus addresses LP: #396736, LP: #457655, LP: #458413, LP: #459290, LP: #459689. The lack of this fix causes notification bubbles to be really tiny (see http://launchpadlibrarian.net/34315070/screenshot_001.png), should the user have set a font point-size of e.g. 8,5. I regard this fix to be critical within the scope of immediate user-experience of Karmic and taking into account a users system setup, which might not be the default "Sans 10"-case.