add indices; start cascaded deletes
bug fix for removing from foreign lists
add indices
add indices
add indices
update examples
Merge pull request #18 from jmcarp/master

add indices
Caching at a good point; still needs work though.
validation tests
Merge branch 'master' of https://github.com/meli-lewis/modular-odm into develop

Conflicts:
	.gitignore
Adds custom exceptions and associated tests
Reorganizes validator tests
Adds tests for min and max value validators
cascaded deletes; detached records
update backref structure
update backref structure
add detached records
update examples
start string translator
start storage tracking