Added implementation for M-ary tree

[vibhu18116]

Added M_aryTreeNode for use in M_ary tree and an implementation for
M_ary Tree. The work is in reference with issue #101.

[czgdp1807]

Trailing white spaces can be removed by configuring your editor. For VSCode you may refer, https://marketplace.visualstudio.com/items?itemName=shardulm94.trailing-spaces

[codecov]

Codecov Report

Merging #140 into master will decrease coverage by 1.444%.
The diff coverage is 36.170%.

@@              Coverage Diff              @@
##            master      #140       +/-   ##
=============================================
- Coverage   98.179%   96.735%   -1.445%     
=============================================
  Files           21        23        +2     
  Lines         1593      1746      +153     
=============================================
+ Hits          1564      1689      +125     
- Misses          29        57       +28     

Impacted Files	Coverage Δ
pydatastructs/utils/__init__.py	100.000% <ø> (ø)
pydatastructs/utils/misc_util.py	88.888% <30.769%> (-8.548%)	⬇️
pydatastructs/trees/m_ary_trees.py	34.375% <34.375%> (ø)
pydatastructs/trees/__init__.py	100.000% <100.000%> (ø)
pydatastructs/graphs/graph.py	100.000% <0.000%> (ø)
pydatastructs/graphs/__init__.py	100.000% <0.000%> (ø)
pydatastructs/graphs/algorithms.py	100.000% <0.000%> (ø)
pydatastructs/graphs/adjacency_list.py	100.000% <0.000%> (ø)
pydatastructs/graphs/adjacency_matrix.py	100.000% <0.000%> (ø)
... and 7 more

[czgdp1807]

This PR doesn't need unit tests as they will be added when m-ary search trees will be added.

[czgdp1807]

Looks like we need some changes in the API of BinaryTree. I will open an issue for it shortly.

[vibhu18116]

I don't see which files are causing the Travis to break. Can you please help out with this?

[HarsheetKakar]

I don't see which files are causing the Travis to break. Can you please help out with this?

Try running tests in vs code. It will tell you the file name and the line number which is having tab spaces in it.

[czgdp1807]

It's because tabs are being used for indentation. Please see the logs at https://travis-ci.org/github/codezonediitj/pydatastructs/builds/662786370?utm_source=github_status&utm_medium=notification

[vibhu18116]

It shows line number 69 in file test_code_quality.py. However, I have not edited and committed this file at all.

[vibhu18116]

If you suggest, I can reset my working branch with the pydatastructs/master and then push again after making necessary changes. It might sort out the issue.

[czgdp1807]

The problem is with the following line,

E                   AssertionError: Tab present at 	MAryTreeNode, MAryTree
E                      in /home/czgdp1807ssd/codezonediitj/pydatastructs/pydatastructs/trees/__init__.py. Configure your editor to use white spaces.

Acutally I didn't supply %(line, file_path). Therefore the problem wasn't visible. I am making a PR to fix it. Will restart the tests so that it's visible on Travis CI.

[czgdp1807]

Merging. Test coverage will reduce a bit. Adding MArySearchTree will fix that thing.

[czgdp1807]

@vibhu18116
Reminder
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