Disable the YUICompressor and closure compiler tests

They're annoying because the fail on Travis half of the time.
Added transform for setting isFragment to false on assets without incoming relations (One-com/assetgraph-builder#109).
1.6.2
transforms/flattenRequireJs: When adding a require call at the end of a data-main included file with only a define call, use the async require version. Avoids this error: http://requirejs.org/docs/errors.html#notloaded
Merge pull request #144 from One-com/isRequired

Keep track of RequireJS relations on JavaScript assets to avoid UMD
pattern problems in non-require cases