fix contributors file, re-arranges scripts structure and requirements

CONTRIBUTORS.md

@@ -18,6 +18,8 @@
 # Contributors
 
 - **[Victor Salimonov](https://github.com/VikTorSalimonov)**
-- **[Sebastián Yonekura](https://github.com/syonekura)**
-
   * Documentation, screencasts
+
+- **[Sebastián Yonekura](https://github.com/syonekura)**
+  * [convert_to_voc.py](cvat/utils/convert_to_voc.py) - an utility for 
+  converting CVAT XML to PASCAL VOC data annotation format.
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cvat/requirements/base.txt

@@ -21,5 +21,4 @@ rq==0.10.0
 scipy==1.0.1
 sqlparse==0.2.4
 django-sendfile==0.3.11
-dj-pagination==2.3.2
-pascal-voc-writer==0.1.4
+dj-pagination==2.3.2
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\ No newline at end of file

cvat/utils/requirements.txt

+pascal-voc-writer==0.1.4
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