#40 Loader with Nashorn

[tomdye]

Addresses issue: #40
This works when nashorn is used the following way:

jjs -scripting path/to/loader.js -- main.js

Where main.js is an AMD module that may require other modules

Initial PR for discussion.

[codecov-io]

Current coverage is 93.03%

Merging #62 into master will decrease coverage by -1.32% as of deaa5be

@@            master     #62   diff @@
======================================
  Files            1       1       
  Stmts          478     488    +10
  Branches       113     117     +4
  Methods         71      72     +1
======================================
+ Hit            451     454     +3
- Partial          3       4     +1
- Missed          24      30     +6

Review entire Coverage Diff as of deaa5be

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