logger: Use a more _pythonic_ logging

- Uses a formatter for coloring output
- Move the `progress_aware` decorator logic to the logger itself
- Refactor modules so each one uses their own instance of a logger

Close #1753

dvc/command/commit.py

@@ -1,12 +1,15 @@
 from __future__ import unicode_literals
 
 import argparse
+import logging
 
-import dvc.logger as logger
 from dvc.exceptions import DvcException
 from dvc.command.base import CmdBase, append_doc_link
 
 
+logger = logging.getLogger(__name__)
+
+
 class CmdCommit(CmdBase):
     def run(self):
         if not self.args.targets:
@@ -21,7 +24,7 @@ class CmdCommit(CmdBase):
                     force=self.args.force,
                 )
             except DvcException:
-                logger.error(
+                logger.exception(
                     "failed to commit{}".format(
                         (" " + target) if target else ""
                     )