-d and --outdir options are not equivalent
The compiler help message states these options as equivalent:
```
  -t <language> | --target <language>
        target languages (graphviz, csharp, all, perl, java, go, cpp_stl, php, python, ruby, javascript)
  -d <directory> | --outdir <directory>
        output directory (filenames will be auto-generated)
  -I <directory>:<directory>:... | --import-path <directory>:<directory>:...
        .ksy library search path(s) for imports (see also KSPATH env variable)
```
But `-d` and `--outdir` options behave differently:
```
$ ls
bin  formats  lib  test.ksy
$ ./bin/kaitai-struct-compiler -t java --outdir test test.ksy
$ ls
bin  formats  lib  test  test.ksy
$ rm -r test
$ ./bin/kaitai-struct-compiler -t java -d test test.ksy
[residual] arg = 'test'
[residual] arg = 'test.ksy'
# Executing command line:
java
-cp
/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/io.kaitai.kaitai-struct-compiler-0.8-SNAPSHOT.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/org.scala-lang.scala-library-2.11.7.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/com.lihaoyi.fastparse_2.11-0.4.1.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/com.lihaoyi.fastparse-utils_2.11-0.4.1.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/com.lihaoyi.sourcecode_2.11-0.1.1.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/org.yaml.snakeyaml-1.16.jar:/home/trosinenko/tmp/kaitai_struct/compiler/jvm/target/universal/kaitai-struct-compiler-0.8-SNAPSHOT/lib/com.github.scopt.scopt_2.11-3.4.0.jar
io.kaitai.struct.JavaMain
-t
java
test
test.ksy

test (Нет такого файла или каталога)
$ ls
bin  formats  lib  src  test.ksy
```

**test.ksy**:
```
meta:
  id: test
  endian: le
seq:
  - id: data
    size: 10
```