- Adds support for reading and merging properties from multiple
  properties.  The first file provided is required, and all subsequent
files are treated as optional where property values from subsequent files
override those in preceeding files.
- Adds unit tests for the multiple file behavior
- Adds description of multiple file behavior to README.md
- Fixes a pre-existing jshit warnings
- Adds vim swap files to the .gitignore
release 0.1.2