Isatools

This minor update release of `isatools` fixes some bugs reported up to 119.

For more information on the known issues with this release, please check the documentation at http://isatools.readthedocs.org

This minor update release of `isatools` fixes a bug reported in 116.

For more information on the known issues with this release, please check the documentation at http://isatools.readthedocs.org

This release of `isatools` implements two new ISA validators:
- ISA JSON content validation, checking content is properly formed and linked within documents
- Replacement fo the legacy ISA tab validation (the Java converter) with a pure Python implementation.

For more information on the known issues with this release, please check the documentation at http://isatools.readthedocs.org

- Fix for issues 92
- Updates to travis config

Minor updates to distribution errors in previous tag.