Merge pull request #1 from limejelly/master

Restructure
[core] sqlite statement
[core, test] sqlite sttm test
Merge pull request #2 from d-kunin/sql-statment

Sql statment
[core, style] style fixes, exec impl
[core, test] exec tests.
Merge pull request #3 from d-kunin/sql-statment

Sql statment
Merge branch 'master' of github.com:d-kunin/electric_orm