Merge pull request #26 from sheganinans/master

7.8 Fixes and Warp fixes
Composable caching
modified witerate to work with http caching
added an examole cachingDataset.hs that navigate a dataset with witerate
Merge branch 'master' of github.com:agocorona/MFlow
Composable caching:
Now the programmer can express independently the
caching policies for each widget.
A new HTTP-caching example: CachingDataset.
cache directives added to widgets
added conduit-extra
removed runSecurenavigation to make it run with old warp libraries in heroku
demo
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