Move conda support files next to the code

Better than in a separate files dir IMO

MANIFEST.in

@@ -1,4 +1,4 @@
 include *.md
 include LICENSE
 include setup.cfg
-recursive-include repo2docker/files *
+recursive-include repo2docker/buildpacks *

repo2docker/buildpacks/base.py

@@ -381,7 +381,7 @@ class BuildPack(LoggingConfigurable):
 
         for src in sorted(self.build_script_files):
             src_parts = src.split('/')
-            src_path = os.path.join(os.path.dirname(__file__), '..', 'files', *src_parts)
+            src_path = os.path.join(os.path.dirname(__file__), *src_parts)
             tar.add(src_path, src, filter=_filter_tar)
 
         tar.add('.', 'src/', filter=_filter_tar)

repo2docker/buildpacks/conda/__init__.py

@@ -3,7 +3,7 @@ Generates a variety of Dockerfiles based on an input matrix
 """
 from traitlets import default
 import os
-from .base import BuildPack
+from ..base import BuildPack
 
 
 class CondaBuildPack(BuildPack):

repo2docker/buildpacks/python/__init__.py

@@ -3,7 +3,7 @@ Generates a variety of Dockerfiles based on an input matrix
 """
 from traitlets import default
 import os
-from .base import BuildPack
+from ..base import BuildPack
 
 
 class PythonBuildPack(BuildPack):