FsStorage and documentation of it in README
fixed path to attachments module. Replaced comma with colon in readme code snippet.
Merge remote-tracking branch 'upstream/master' into fsstorage
Merge pull request #10 from nuarhu/fsstorage

FsStorage : provider implementation to store images in local file system
added note on stable release to README and added CHANGELOG.md as described in https://github.com/firebaseco/mongoose-attachments/issues/15
Merge pull request #16 from nuarhu/versionprep010

Change and Release Tracking in README.md and CHANGELOG.md