Minor documentation corrections:

1: Corrected plugin artefact co-ordinates
2: Corrected example usages of 'from'

Thought I'd submit these minor doc tweaks in case they're of interest.

I was reading the gradle-rpm-plugin issue list last night and noticed this plugin had recently been created (great work by the way!). I noticed that this plugin works well with Gradle 1.10 whereas I know the original RPM plugin has a few issues using internal Gradle APIs which have changed between releases (CopySpec etc). So I was wondering if there's an intention to replace the gradle-rpm-plugin with this one?