Implement basic Webpack loader

[lijunle]

• Reference Webpack loader support #42
• This is the first release, only the feature marked with [1] in the list is supported.

[codecov-io]

Current coverage is 97.67%

Merging #56 into master will decrease coverage by -0.11% as of 934644e

@@            master     #56   diff @@
======================================
  Files            9      10     +1
  Stmts          226     258    +32
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit            221     252    +31
  Partial          0       0       
- Missed           5       6     +1

Review entire Coverage Diff as of 934644e

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