Rework

[solnic]

Summary

• Add HTTP::Schema and HTTP::Attribute
• Add custom HTTP::MapperCompiler
• Remove manual transformations in favor of auto-mapping feature from core
• Remove applying transformations in insert/update - this type of functionality is not supported by core and it's actually something we intentionally do not want to have. Input that doesn't match canonical data structures can be handled by changesets with their mappings
• Refactor Dataset so that it only uses its options
• Remove Dataset#name as it felt like additional complexity
• Remove Dataset::ClassInterface (we're in beta phase, no need to go through deprecation cycles)
• Add Dataset#{get?,post?,put?,delete?}
• Remove HTTP::Relation#wrap as this is now a core method and it does something else
• Simplify specs

[solnic]

@AMHOL @cflipse @flash-gordon @timriley ding dong, please check this out. I'd love to get it done and add a couple features (associations mostly and a built-in json adapter specialization) on top of this rework.

[cflipse]

Looks okay so far

[solnic]

I merged this in, feel free to provide further feedback here though, and I'll address it in new PRs or directly in master.

[AMHOL]

@solnic can this branch be deleted?