gseaplot font sizes cannot be changed

[SergeMerzliakov]

The gseaplot function source code contains code (gseaplot.gseaResult) which hardcodes title font size:

    p.pos <- p.pos + ggtitle(title) +
        theme(plot.title=element_text(hjust=0.5, size=rel(2)))

Seems like a straightforward enhancement to make font sizes configurable. Attached screen shot (OSX) highlighting the issue.