simplify stencil.merger namespace

[erdos]

[codecov[bot]]

Codecov Report

Merging #152 (325d57d) into master (0203957) will decrease coverage by 0.11%. The diff coverage is 98.79%.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   93.46%   93.35%   -0.11%     
==========================================
  Files          29       29              
  Lines        2036     2018      -18     
  Branches      104      104              
==========================================
- Hits         1903     1884      -19     
- Misses         29       30       +1     
  Partials      104      104              

Files	Coverage Δ
src/stencil/tokenizer.clj	96.77% <ø> (ø)
src/stencil/util.clj	95.40% <ø> (-1.27%)	:arrow_down:
src/stencil/merger.clj	98.92% <98.79%> (-0.15%)	:arrow_down:

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