[ENH] Added test_mtx_fmt function

[akimbler]

Works on #1.

Changes proposed in this pull request:

• Add function to test the directionality and binary/weighted status of an input connectivity matrix.

[codecov-io]

Codecov Report

Merging #34 into master will decrease coverage by 0.13%. The diff coverage is 8.33%.

@@            Coverage Diff            @@
##           master     #34      +/-   ##
=========================================
- Coverage   41.64%   41.5%   -0.14%     
=========================================
  Files          41      41              
  Lines        4990    5002      +12     
=========================================
- Hits         2078    2076       -2     
- Misses       2912    2926      +14

Impacted Files	Coverage Δ
brainconn/utils/matrix.py	61.33% <8.33%> (-10.1%)	:arrow_down:
brainconn/tests/test_modularity.py	89.83% <0%> (-2.55%)	:arrow_down:

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[tsalo]

Everything looks good to me. Merging now.