Add new app to handle all dependencies

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

mayan/apps/converter/dependencies.py

@@ -0,0 +1,31 @@
+from __future__ import unicode_literals
+
+from django.utils.translation import ugettext_lazy as _
+
+from mayan.apps.dependencies.classes import BinaryDependency, PythonDependency
+
+from .backends.python import pdfinfo_path, pdftoppm_path
+from .classes import libreoffice_path
+
+BinaryDependency(
+    label='LibreOffice', module=__name__, name='libreoffice',
+    path=libreoffice_path
+)
+BinaryDependency(
+    label='PDF Info', help_text=_(
+        'Utility from the poppler-utils package used to inspect PDF files.'
+    ), module=__name__, name='pdfinfo', path=pdfinfo_path
+)
+BinaryDependency(
+    label='PDF to PPM', help_text=_(
+        'Utility from the popper-utils package used to extract pages '
+        'from PDF files into PPM format images.'
+    ), module=__name__, name='pdftoppm', path=pdftoppm_path
+)
+PythonDependency(
+    copyright_attribute='PIL.__doc__', module=__name__, name='Pillow',
+    version_string='==6.0.0',
+)
+PythonDependency(
+    module=__name__, name='PyPDF2', version_string='==1.26.0'
+)