Spacy-conll

Minor documentation changes for PyPi.

- Complete overhaul. Can now be used a custom pipeline component in spaCy.
- `Spacy2ConllParser` is now deprecated.
- The CLI interface does not rely on `Spacy2ConllParser` anymore but uses the custom pipeline component instead.
- Added `-e|--no_force_counting` to the CLI options. By default, when using `-d|--include_headers`,
parsed sentence will be numbered incrementally. This can be disabled so that the sentence numbering depends on how
spaCy segments the sentences.

Minor bugfix.

Added the `-s|--disable_sbd` flag. By default, spaCy does automatic sentence boundary detection. You may not
always want this. When you want to parse every line explicitly as one sentence, you can disable this functionality.

Added the `-t|--is_tokenized` flag. It indicates that your text has already been tokenized and that it should not
be tokenized again. The tokens should be space-separated, e.g. `I like grandma 's cookies !`.

Initial commit.