Plugins: updates merged from moonbase (florin).

I omitted one update that seemed to be broken.
xfce4-cpugraph-plugin: version bumped to 1.0.4.
xfce4-cpugraph-plugin: removed the XFCE4_PREFIX line.
Merge pull request #2 from Florin65/master

removed the XFCE4_PREFIX line for xfce4-cpugraph-plugin. version bumped to 1.0.4.
xfce4-netload-plugin: version bumped to 1.2.0.
Merge pull request #4 from Florin65/master

xfce4-netload-plugin: version bumped to 1.2.0.
xfce4-weather-plugin: version bumped to 0.8.0.
Merge pull request #5 from Florin65/master

Florin's update
xfce4-weather-plugin: version bumped to 0.8.1.
Merge pull request #6 from Florin65/weather

xfce4-weather-plugin: version bumped to 0.8.1.
ristretto: version bumped to 0.6.3.
Merge pull request #7 from Florin65/ristretto

ristretto: version bumped to 0.6.3.
xfce4-weather-plugin: version bumped to 0.8.2.
Merge pull request #8 from Florin65/master

xfce4-weather-plugin: version bumped to 0.8.2.
parole: version bumped to 0.3.0.3.
Merge pull request #9 from Florin65/parole

parole: version bumped to 0.3.0.3.
xfce4-mixer: version bumped to 4.10.0.
Merge pull request #10 from Florin65/master

xfce4-mixer: version bumped to 4.10.0
exo: version bumped to 0.10.0.
Thunar: version bumped to 1.6.0.