Refine the bin special parser to be stable.

[lijunle]

• It supports $(npm bin)/binary-entry style command
• It supports command prefixed with environment variable set.
• Test cases are refactored to be data-driven + test helper pattern.
• Currently, the identification bases on space split word matching.

[codecov-io]

Current coverage is 97.56%

Merging #64 into master will increase coverage by +0.05% as of f84fd4f

@@            master     #64   diff @@
======================================
  Files           12      12       
  Stmts          282     287     +5
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            275     280     +5
  Partial          0       0       
  Missed           7       7       

Review entire Coverage Diff as of f84fd4f

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