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
Merge pull request #16 from nuarhu/versionprep010

Change and Release Tracking in README.md and CHANGELOG.md
merge from firebaseco master