Add instanceOf to rules in readme.md
Update en.php to include instanceOf
Fixes #64. Updated validateDateFormat to use warning_count for validation check
Merge pull request #88 from JustinHook/invalid-dateformat

Fixes #64. Updated validateDateFormat
Show instance name in instanceOf error message
Merge pull request #85 from Typeform/master

Add instanceOf to rules in readme.md
refactor to avoid foreach when filtering
added instanceOf to spanish language
typo fix
Merge pull request #91 from ecoreng/filter-refactor

refactor to avoid foreach when filtering
syntax fix.

Missing comma after lengthMax
Merge pull request #95 from ry167/patch-1

syntax fix.