Merge pull request #9 from KSDaemon/master

Make a title and icon attributes optional for a hash-table API call - Thanks to KSDaemon
when using $.growl with options param only

default_options was always used when passing only options object to $.growl function.

thank you for this plugin!
Merge pull request #11 from baltazarqc/patch-1

when using $.growl with options param only
Update README.md

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