pkgconfig: fix error message:

no error message was displayed because of missing name argument
EventLoop: prevent adding the same timer twice
Adapt main default structure to build with hoe and rake-compiler
Adapt require in tests (for rake test)
Initialize members
Fix full_test
Fix dependecy list, i.e. remove nokogiri dependency, since it is not used by utilrb
and add required gems to ROS Makefile
Convert 'rosdep' dependency statement to 'depend'
Fix utilrb/doc/rake
Fix README setup

Currently, as a temporary bugfix there is a duplication of the README.
Full restructure of utilrb in future version will transition this out.
Merge branch 'next'

This merge omits the README fix, since it is already considered by the previous
restructuring of the build
Merge remote-tracking branch 'autobuild/master'

Conflicts:
	Makefile
	Rakefile
	manifest.xml