Revert "Extend function fix"

This reverts commit 7bb5a0fc6d69ca85f1d1f3daacc575f9aca19e4d.
Revert "Extending ng-model functionality to hidden fields"

This reverts commit 33c673887741c7a57413884faaee03e8f8f772e7.
Revert "jQuery compatible element() selector"

This reverts commit bf285d348f56b02846ba484939df20aa2a87a6d4.