Merge tag '0.1.0' into develop

Implement value columns
Tree#opts: add hash to store options on tree
Query#sql: set Tree#opts[:sql_only] true when calling
Define/Recall: hacks so DB#create_table isn't called by Query#sql
Merge branch 'feature/faster_sql' into develop
Version: bump to 0.1.1
Merge branch 'release/0.1.1'