Download attachments from page

[gkowalc]

Created new method Confluence "download_attachments_from_page". Method downloads attachments from given page id and saves them to the current directory (where the script is run) when using default path=None parameter.

It is possible to select other directory path by specifying absolute path. If custom directory doesn't exist or there is a permission error method should raise an error.

I run local tests on macos and linux hosts.

In addition to above, I also added relevant example usage and updated the docs.

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (3e1ef05) 34.51% compared to head (47dff27) 34.43%.

Files	Patch %	Lines
atlassian/confluence.py	4.34%	22 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1283      +/-   ##
==========================================
- Coverage   34.51%   34.43%   -0.09%     
==========================================
  Files          45       45              
  Lines        8184     8207      +23     
  Branches     1134     1140       +6     
==========================================
+ Hits         2825     2826       +1     
- Misses       5245     5267      +22     
  Partials      114      114              

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