Better defaults for asset_sync.yml generator

Disable asset_sync in `development` and `test` environments
Set a different `fog_directory` for `staging` from `production`
Prepare for integration specs by namespacing of spec:unit

* Moved all unit tests to spec/unit
* Moved all 'fixture' rails apps to spec/fixtures
* rake spec:unit task, and is now default
Update README.md

Adding Google Storage Cloud configuration
First attempt at AWS integration test suite
Ignore tmp
Add travis.yml ENV
Use different travis.yml ENV syntax
Run integration specs by default
Use 1.8.7 hash syntax in specs
Use a fog 'prefix' to allow test sync runs to be ran in parallel
Merge pull request #141 from fredguth/master

Added Google Storage Cloud configuration to readme
Merge pull request #137 from turadg/patch-1

Better defaults for asset_sync.yml generator
Namespace AssetSync::Engine to prevent conflicts
Merge integration-tests into master
Version 0.5.2, improve defaults and docs, add integration specs and more
Add assertions for content type in integration specs
Set content-type on uploaded gz files so they don't get the S3 default of 'application/x-gzip' which browsers don't seem to like.
Fix extraction of uncompressed filename for .gz mime type setting
Fix specs, a gzipped file should retain original content type yet have a content encoding of gzip
Version 0.5.3, improved handling content type / content encoding for gzipped files