* Make dir for babel --out-file
Currently there's unexpected regression after upgrade from babel 6.
On creating file with any depth like dist/index.js the error about
not existing directory is thrown.
In this diff I modified babel-cli to create deep directory for out-file
command.
I also replaced `mkdirp` with more supported `make-dir` package which
also have official promise support.
* Fix test
* fix: disable caching when babel could not read/write cache
* emit warning when cache folder resides in readonly fs
* fix: always register save handler
* cache: maintain old behaviour
* test: add more test case
* fix: next tick tasks are FIFO
* test: disable test on Windows
Removed `@flow` annotation from files that don't actually pass Flow check at the moment. These will be added back file by file once the files are properly converted to use Flow.
Closes#3064
