bump Python driver to 1.13.0-3
release notes for 1.13.4

Closes #2918
fixing continuation of sindex postconstruction after restart
adding test for continuation of sindex post-construction after server restart
Per #2930 use better error message

Conflicts:

	src/rdb_protocol/shards.cc
Distinguish grouped & non grouped cases in errmsg

Conflicts:

	src/rdb_protocol/shards.cc
Handle case of grouped data with only one group
Add edge detection cases for bizarre size limits
Disallow bizarre size limits
adding r.binary support to the server
adding support for r.binary with nested terms to the drivers
adding tests for r.binary with nested terms
Fix stupid compilation error
Merge branch 'next' into sam_2134