Correct the require parameters.

They shall be upper case. See
http://docs.puppetlabs.com/learning/ordering.html#before-and-require
for more information.
Add parameters for Archlinux.
Make the timeout of plugin installation adaptable.

This is needed for large plugins that need more time on slower machines.
Remove linebreak at plugin install template.

This linebreak broke plugin install in eclipse juno.
Merge pull request #5 from martinschulze/master

Parameters for archlinux, timeout for plugin installation, typos and linebreak issue.