Fixing broken travis/appveyor to proper test memory-leaks nmslib#398

Merge branch 'master' of github.com:nmslib/nmslib

bumping up the version.

Bumping up version

bumping up NMSLIB version

Changing version in the README.

An additional fix for nmslib#327

Bumping up the version.

updating README for 1.7.1

nudging Travis to re-run tests.