Bump to 2.6.0.2dev
Add author_email in setup.py for PYPI metadata
Invalid syntax in index.py in _error_messages #2086

* This patch includes a fix in index.py, as _error_messages takes a
  dictionary
Merge pull request #1 from simmianand/feature/task-2086

Invalid syntax in index.py in _error_messages #2086
Bump version to 2.6.0.2
Merge branch 'release/2.6.0.2'