add kannada support (#3264)

* add kannada support

* add few more stop words

* add support for Kannada Language

.github/contributors/akki2825.md

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+## Contributor Agreement
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+## Contributor Details
+
+| Field                          | Entry                |
+|------------------------------- | -------------------- |
+| Name                           | Akhilesh K R         |
+| Company name (if applicable)   |                      |
+| Title or role (if applicable)  |                      |
+| Date                           | 2019-02-12           |
+| GitHub username                | akki2825             |
+| Website (optional)             |                      |

spacy/lang/kn/__init__.py

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+# coding: utf8
+from __future__ import unicode_literals
+
+from .stop_words import STOP_WORDS
+from .lex_attrs import LEX_ATTRS
+
+from ..norm_exceptions import BASE_NORMS
+from ...language import Language
+from ...attrs import LANG
+
+
+class KannadaDefaults(Language.Defaults):
+    stop_words = STOP_WORDS
+
+
+class Kannada(Language):
+    lang = 'kn'
+    Defaults = KannadaDefaults
+
+
+__all__ = ['Kannada']

spacy/lang/kn/stop_words.py

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+# coding: utf8
+from __future__ import unicode_literals
+
+# Stop words
+
+STOP_WORD = set("""
+ಈ
+ಮತ್ತು
+ಹಾಗೂ  
+ಅವರು  
+ಅವರ  
+ಬಗ್ಗೆ  
+ಎಂಬ
+ಆದರೆ
+ಅವರನ್ನು
+ಆದರೆ
+ತಮ್ಮ 
+ಒಂದು
+ಎಂದರು
+ಮೇಲೆ
+ಹೇಳಿದರು
+ಸೇರಿದಂತೆ
+ಬಳಿಕ
+ಆ
+ಯಾವುದೇ
+ಅವರಿಗೆ
+ನಡೆದ
+ಕುರಿತು
+ಇದು
+ಅವರು
+ಕಳೆದ
+ಇದೇ
+ತಿಳಿಸಿದರು
+ಹೀಗಾಗಿ
+ಕೂಡ
+ತನ್ನ
+ತಿಳಿಸಿದ್ದಾರೆ
+ನಾನು
+ಹೇಳಿದ್ದಾರೆ
+ಈಗ
+ಎಲ್ಲ
+ನನ್ನ
+ನಮ್ಮ
+ಈಗಾಗಲೇ
+ಇದಕ್ಕೆ
+ಹಲವು
+ಇದೆ
+ಮತ್ತೆ
+ಮಾಡುವ
+ನೀಡಿದರು
+ನಾವು
+ನೀಡಿದ
+ಇದರಿಂದ
+ಅದು
+ಇದನ್ನು
+ನೀಡಿದ್ದಾರೆ
+ಅದನ್ನು
+ಇಲ್ಲಿ
+ಆಗ
+ಬಂದಿದೆ.
+ಅದೇ
+ಇರುವ
+ಅಲ್ಲದೆ
+ಕೆಲವು
+ನೀಡಿದೆ
+ಇದರ
+ಇನ್ನು
+ನಡೆದಿದೆ
+""".split())