Feature/fragment names

[erdos]

add a getAllFragmentNames method to the TemplateVariables class to query all referenced fragment names. Solves #26

[codecov-io]

Codecov Report

Merging #27 into master will decrease coverage by 0.15%.
The diff coverage is 82.6%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage    91.3%   91.14%   -0.16%     
==========================================
  Files          19       19              
  Lines        1368     1389      +21     
  Branches       84       88       +4     
==========================================
+ Hits         1249     1266      +17     
  Misses         35       35              
- Partials       84       88       +4

Impacted Files	Coverage Δ
src/stencil/model.clj	92.33% <100%> (ø)	⬆️
src/stencil/process.clj	76.92% <81.25%> (+1.92%)	⬆️
src/stencil/cleanup.clj	92.95% <83.33%> (-0.43%)	⬇️

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[erdos]

Seems good to me.

The coverage decrease is due to a bug in cloverage in handling the for macro.

Some manual testing is required, but will be included in the next release in a few days.