Several fixes to "make check-examples":

* fixed -pthread issue: Passing POSTLINKFLAGS to undocumented/libshogun/check.sh
** small changes to src/shogun/Makefile: Do not modify POSTLINKFLAGS from config

* fixed "make check-examples": now works without need for run "make install" first
** check-examples now passes library/include paths from source tree instead of target paths
** Added new makefile variable ABSCONFIGPATH with absolute config path

* Fixed check-examples-cmdline_static to run from inside eclipse
** PATH and LD_LIBRARY_PATH now point to source directory instead of target directory