fix typo when deleting keys
Merge pull request #23 from vanetix/patch

Fix typo in normalize
don't try and cast non existing values
add travis config
Update README.md

add travis status image
fix validation issue with empty string
fix check for a required and boolean type
fix for boolean defaults when set to false
return null if no values are found. closes #26
ensure register collection method is called on all adapters a model uses
add example indexes to readme
added undefined check to typecast
Merge pull request #29 from Zolmeister/master

added undefined check to typecast
added to types.js
Merge pull request #31 from wanderer/master

added array to types.js
Added error message for deprecated findAll().
fix: error with uppercase types. closes #35
add tests for lifecycle callback array stack. closes #33
added better promise support
fixed .then promise