0.0.1 - Reduced loop processing in replace method

- Added check before running replace method to skip further processing
if it is known that files have not yet been revisioned. This should
make the process less resource intensive.
- Full path shown for files with errors in log message
- Added version to module exports
0.0.2 - Added manifest file for use in javascript

- Manifest file lists resolved asset files for use in javascript
expressions
- Manifest file uses revision hash to cache bust
- Manifest is written on a timeout to reduce multiple fs writes
- Manifest should be written above all js files using
asset://manifest.js