Rakefile: enable non-default LIBYUI_PREFIX
autodocs: enable JAVADOC_AUTOBRIEF

Having it disabled requires code to declare it with @brief or \short
which is not the case.

Also, in graphs, find dependencies via STL containers.
docs: YItemCollection, YTableCellCollection and iterators
Merge pull request #81 from libyui/autodocs

Autodocs
use distribution specific lib path

some distros use /lib instead of /lib64
added .travis.yml
README.md - added Travis badge
added changes, fixed style (white spaces)
Merge pull request #82 from lslezak/travis

Added Travis integration
Merge remote-tracking branch 'upstream/master'

Conflicts:
	ChangeLog