Merge pull request exxeleron#34 from exxeleron/qpython-1.1-dev

qpython 1.1

Merge branch 'master' into qpython-1.1-dev. Resolves (exxeleron#30)

Enhancement: configuration of serialization for single element strings

Travis: Migrating from legacy to container-based infrastructure

PyPI integration

Documentation update: pandas type hinting

Merge branch 'master' of github.com:exxeleron/qPython

Fix pandas unit test execution on Travis

Update CHANGELOG.txt

Redesign lambdas and projections handling

Fixes exxeleron#7: validate lambda expression upon construction