Fix link to tarball (it changes on every build).

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Update index.rst

Merge pull request getredash#498 from EverythingMe/feature/ds_admin

Feature: datasources web admin (closes getredash#193)

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Merge pull request getredash#483 from erans/master

Feature: Updated more fine grained support for CORS in QueryResultAPI

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Merge pull request getredash#471 from EverythingMe/fix/visualization_api

Fix: opening viz editor resets its options