Update rhythmbox dependencies to more recent versions

[crvigh]

Package	Current version	Recent version
tdb	1.4.2	1.4.3
libpeas	1.24.0	1.28.0
totem-pl-parser	3.26.2	3.26.5
libdmapsharing	2.9.39	2.9.41
libgee	0.20.0	0.20.3
avahi	0.7	0.8

[crvigh]

I'll submit a pull request if the above changes look good.

[hadess]

It's probably fine, but please make sure that every change is separate and at least a little bit justified in terms of what it means for rhythmbox (eg. "Podcast parsing bug fixes" for totem-pl-parser is a no-brainer, but why do we need the libgee update?)

[bbhtt]

I've made the changes in #61 in separate commits. totem-pl-parser is already on a commit newer than the latest tag.