model caching
Merge pull request #417 from shmax/implement-model-caching

model caching
remove test.db, ignore all .db files
coding style, cleanup of 1ed2239
Merge pull request #421 from koenpunt/remove-test-db

Remove test db
Fix notice-level error when cache not configured
Merge pull request #435 from shaneiseminger/master

Fix notice-level error when cache not configured
The PHPUnit XML file is a default distributed one,
so should be marked as such
Setting strict defaults to test how far we can push
the testing...
Updating the Travis script to run the correct config
Adding the non-distributed `phpunit.xml` file to
the `.gitignore`
Merge pull request #437 from Rican7/feature/phpunit-hardening

Feature - PHPUnit hardening
Fix invalid range option exception in Validations::validates_length_of() in lib/Validations.php
Use absolute import path for Relationship.php

closes #447
Merge pull request #448 from jpfuentes2/jpfuentes2/use_absolute_require

Use absolute import path for Relationship.php
store reference to sqlite db in static to be accessible in tearDownAfterClass
fixes #462
Merge pull request #463 from koenpunt/fix-db-cleanup

store reference to sqlite db in static to be accessible in tearDownAfterClass
Merge pull request #442 from Great-Antique/master

Fix exception message on range validation
fix find by null
Merge pull request #420 from shmax/find-null

test for finding by null