[FIX] Update gii file handling

[emdupre]

Closes #33.

Changes proposed in this pull request:

• Parses gii files supplied in an *.[L,R].fun.gii format
• Skips spatial filtering for gii files in sel_comps

[codecov]

Codecov Report

Merging #63 into master will decrease coverage by 0.03%.
The diff coverage is 57.89%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   23.37%   23.34%   -0.03%     
==========================================
  Files          23       23              
  Lines        1335     1341       +6     
==========================================
+ Hits          312      313       +1     
- Misses       1023     1028       +5

Impacted Files	Coverage Δ
tedana/selection/select_comps.py	0% <0%> (ø)	⬆️
tedana/tests/test_utils.py	100% <100%> (ø)	⬆️
tedana/utils/utils.py	78.26% <62.5%> (-1.49%)	⬇️

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