* Remove secure-random from dev-deps (#610)
* fix ensureDir() doc
* moveSync: refactor to use renameSync
* copy*(): fix copying bind-mounted directories (#618)
* copy*(): fix copying bind-mounted dirs
* copy*(): fix case-insensitive-paths tests
* copy*(): refactor to check paths more efficiently
* destructure stats object after checking err
* move*(): check paths before moving
* move*(): add case-insensitive paths test
* remove unnecessary done callback from test
* copy*(): add new option checkPathsBeforeCopying
* update copy*() docs to include checkPathsBeforeCopying
* some reformatting
* copy*(): use fs.stat with bigint option
* move*(): refactor to use the internal stat functions
* move*(): add test for prevent moving identical
* disable graceful-fs in copy and move tests
* fix parsing node version
* tiny reformat
* update copy*() docs
* refactor parsing node version
* use semver to parse node version in tests
`fs.writeFile()` supports a buffer or a file descriptor as 1st argument (`file`), but `fs-extra.outputFile()` does not. Because it sends `file` parameter to `path.dirname()` that requires `String`.
