adds docs for index_create, index_drop, and index_list
add body for index_drop
docs for get_all
docs for between
lore fixes
fix bad regression 665 test
Merge branch 'next' into sindex_docs

Conflicts:
	test/rql_test/src/regression/665.yaml
get docs validating
changes for code review
fixes validation problems
add forgotten .run
increasing the tcp accept backlog due to it being unreasonably low
Enable docs validation on travis

Closes #691

Review 490 by @mlucy
Merge branch 'next' into sam_libcxx