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[tx-robot] updated from transifex
DB: sortindex can be negative as well

The column ```oc_mozilla_sync_wbo.sortindex``` can be negative. Set the
column to *signed* in the ```appinfo/database.xml``` file.

Fixes #74.
Bump version to 1.3.1, update changelog
[tx-robot] updated from transifex
[tx-robot] updated from transifex
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[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
[tx-robot] updated from transifex
Update README.md

Remove recommendations for specific TLS cipher suites in the README.md. Add links to external sites with further information.