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