update google scholar link
update readme
Merge pull request #2601 from karlnapf/develop

some doc updates
Delete tests/integration/tests symlink.

It is outdated since the hierarchy now is testsuite/pythonX-tests.
Merge pull request #2603 from iglesias/develop

Delete tests/integration/tests symlink.
fix half of issues in the KL notebook
Merge pull request #2605 from yorkerlin/develop

fix half of issues in the KL notebook
CEMMixtureModel removing log_sum_exp redudancy