Only link against librt if on Linux, not on Apple or Windows.
add missing include cmath in visitors.hxx
Merge pull request #234 from joergkappes/master

add missing include cmath in visitors.hxx
Merge pull request #233 from chaubold/fix/combilp_mac

Only link against librt if on Linux, not on Apple or Windows.
Merge pull request #232 from homul/master

Nesterov algorithm added. Caller for it is still pending
Merge pull request #62 from opengm/master

update from opengm:master
 fix bug in astar
Merge pull request #235 from joergkappes/master

Fig AStar bug
Merge pull request #1 from opengm/master

getting updates from master repo