Refactor for mixins

[LinuxBozo]

Refactor the engine to make use of mixins. Refactor out globals as well and make use of getter/setters.

[LinuxBozo]

For cfpb/hmda-pilot#305

[poorgeek]

Any particular reason why the tests for lib/engineCustomConditions.js and lib/engineCustomDataLookupConditions.js aren't in their own specs?

[poorgeek]

Do comments like these actually add anything anymore? When everything was in single file they did help delineate between different areas, but now that you've modularized the code it seems like they should be replaced by jsdoc comments on each function. If so, that might be part of the system documentation task.

[LinuxBozo]

They are just grouping/section type comments, so there still is value, even in the smaller components. Additional jsdoc comments would help, especially documentation tying each function to it's actual edit.

[coveralls]

Coverage increased (+1.68%) to 98.01% when pulling 60a2f5d on LinuxBozo:refactor into 223e720 on cfpb:milestone8.

[coveralls]

Coverage increased (+2.2%) to 98.54% when pulling 6560781 on LinuxBozo:refactor into 223e720 on cfpb:milestone8.

[LinuxBozo]

@poorgeek There ya go, tests broken out for the mixins..

[poorgeek]

Cool. Looks good to me!