Explain match types is and nis better

Escape control-characters in generated swagger

When some table's description has `control-characters`, likes
`\t` `\n`,
swagger that generated by `/api.php` is a defective json

Add test for filter in condition with strings

Add test for filter in condition with strings

in seems to work with strings as well

That seems to work fine, so I thought I might as well add a test and document it in the README.

Add Python php_crud_api_transform.py to README

Transform algorithm in python 3

added tests for tenancy + fix for PHP 7.2

Fix typo

Use utf8mb4 instead of utf8 in commented-out starter code

'utf8' in mySQL is actually a 3-byte encoding that cannot encode characters that occupy 4 bytes in UTF-8. 'utf8mb4' is a saner default.

Use PHPUnit\Framework\TestCase instead of PHPUnit_Framework_TestCase