Remove devtools and perftools and axiom. Add sequel dependency.
rm -rf lib/* spec/*
Fix gemspec and remove axiom-memory-adapter
Remove old specs
Remove not used support modules
Add Relation#each backed by a sequel dataset
Move requires
Add Mapper#each
Add missing gem deps and clean up rakefile
Add in-memory join operation

The idea is to have a RA in-memory layer on top of db-backed relations.
This allows us to simply combine data coming from different types of
databases using relational interface.
Update README
Update travis config
Not interested in supporting 1.9.3, sorry
Use equalizer for the test model (should make it pass on rbx)
Add ROM.setup
Use jdbc sqlite for jruby
Allow failures on jruby for now
Add abstract adapter and sequel adapter
Move Env and Repository to separate files
Expose "native" query interface through charlatan

This may look controversial as we're leaking entire interface of a
db-access library on the top level. ROM will never encourage using this
interface however for the simplicity *and* convenience sake that's how
it's gonna be. In the future we might want to hide it behind something
higher level but this would require a lot of additional layers of
complexity so I'm not sure if we'd ever want to go there.