add support for processing copy/directory file contents.
process content before engine for even more flexibility.
Consistent case for overwrite answers
Error can be passed into async() + new helper method.
Merge pull request #290 from stephenplusplus/async-error

Error can be passed into async() + new helper method.
Merge pull request #280 from ctalkington/copyProcess

add support for processing copy/directory file contents via function.
fixes #294 - bind `this` to `runInstall`.
fix tests from #280.
Update the flow inside the conflicter so it works with 'diff' option
Merge pull request #298 from SBoudrias/conflicter

Fix async flow when diffing a file (Fix #291)
Updated dependencies

Tests are passing and generator-webapp still works.
Version bump
(tests) Allow stubs to return original value + default noop.
Version bump
Fix collision