Implement enhancement request #264

[texadactyl]

Class Waterfall has been enhanced to entertain invocation with a data array and a header dict as an alternative to presenting a file path.

[codecov[bot]]

Codecov Report

Merging #269 (8f47cfa) into master (e7ad0a9) will increase coverage by 0.30%. The diff coverage is 97.59%.

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   82.47%   82.78%   +0.30%     
==========================================
  Files          72       73       +1     
  Lines        3778     3846      +68     
==========================================
+ Hits         3116     3184      +68     
  Misses        662      662              

Impacted Files	Coverage Δ
tests/test_waterfall.py	100.00% <ø> (ø)
tests/test_waterfall2.py	93.33% <93.33%> (ø)
blimpy/waterfall.py	92.07% <100.00%> (+2.27%)	:arrow_up:
setup.py	100.00% <100.00%> (ø)