fix primal objective
Merge pull request #101 from kondra/fix_objective

Primal objective in OneSlackSSVM
fix bug in test, also do less precision....
Merge pull request #103 from amueller/fix_tests

fix bug in test, also do less precision....
make objective_primal consistent with OneSlackSSVM code
DOC fix links to references in examples.
TST add test for datasets, some docs. Closes #81.
rename psi to joint_feature, minor cleanups
update readme: 0.1 is kind of stable. 0.2 even more ;)
DOC: added glpk removal to changelog.