Problem:
My goal was to write XMP metadata to a pdf, but there was metadata attached to the pdf already (because i already attached another entry to it once, but that entry had wrong data), so now there is data that i do NOT WANT to have attached + the data that i WANT to have attached.

Describe the solution you'd like
Add a feature that allows to remove all XMP metadata from one or

Self-explanatory.

At the top level tree node for each window -- where it normally shows "Unsaved" or "Recovered tabs" or a customized label -- can you show the number of open tabs?

Here's why this would be helpful: When I'm researching something on the web, I don't always stop after opening the first tab, switch to TF and put in a custom label. When something causes Chrome to crash, or to be restarted (thank you

TESTS

Tests for get_captions

Located in test_captions_methods.py

Function Tested

def get_captions(self, video_id, lang_code='en', parser=P.parse_caption_track, **kwargs)

TO DO

• parser
• LIST OF VALID VIDEO IDS DOES NOT WORK AND I HAVE NO IDEA WHY
• video_id
• lang_code

Tests for get_channel_id_from_user

Located in `test_channel_methods.

• I'm submitting a ...
  [ ] bug report/ help

• What is the current behavior?
  successfully installed and start app but dont knwo what is default username and password.
  using docker default username and password work but not work on npm based start without used of docker

demo of the problem**
![capture](https://user-images.githubusercontent.com/8135097/42123379-d34c7fb8-7c6e-11e8-93