added cast function for timestamp type
Merge pull request #1340 from crate/h/timestampconversion

added cast function for timestamp type
replaced all occurences of 'Crate Data' with 'Crate'
Merge pull request #1341 from crate/h/docs-wording

replaced all occurrences of 'Crate Data' with 'Crate'
fix alter table add column on partitioned tables
fix: use ColumnPolicy mapping value instead of enum name
fix flaky test
use random ports in GracefulStop integration test
close client in CrateClientTest
fix flaky test due to async schema update
add missing super.tearDown call
update elasticsearch to 1.4.0