Add new app to handle all dependencies

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_parsing/apps.py

@@ -19,6 +19,7 @@ from mayan.apps.documents.signals import post_version_upload
 from mayan.apps.navigation.classes import SourceColumn
 from mayan.celery import app
 
+from .dependencies import *  # NOQA
 from .handlers import (
     handler_index_document, handler_initialize_new_parsing_settings,
     handler_parse_document_version

mayan/apps/document_parsing/dependencies.py

@@ -0,0 +1,15 @@
+from __future__ import unicode_literals
+
+from django.utils.translation import ugettext_lazy as _
+
+from mayan.apps.dependencies.classes import BinaryDependency
+
+from .settings import setting_pdftotext_path
+
+BinaryDependency(
+    help_text=_(
+        'Utility from the poppler-utils package used to text content '
+        'from PDF files.'
+    ), label='PDF to text', module=__name__, name='pdftotext',
+    path=setting_pdftotext_path.value
+)