Read/write operation on blobs (byte sequences) should be as fast as possible by default.

1) `getBytes` now returns data in inner (best available on current platform) format if `toArray` is not set explicitly to `true`; converting data to JS `Array` otherwise.
2) I/O blob operations now work with byte sequences as with blobs of data (not regarding default `littleEndian` for this `jDataView`) what is expected for writing byte sequences and allows not to reverse array on each read/write operation in the case of `jDataView.littleEndian=false`; native formats that need to regard `littleEndian` still can pass it's value explicitly or use `_getBytes`/`_setBytes` private methods.