Allow to pass context around serializers
Nest scope under context option
Extract context build to a method
Merge branch 'context'
Revert "Merge branch 'context'"

This reverts commit 1bd8180a9495b22caf54a9c5c3d883a165135e0b, reversing
changes made to 9bb32331f41442dba1a7059890308b5fb9af113a.
Version = 0.9.0.alpha1
Add license to gemspec