Upping version
Revert "Upping version"

This reverts commit e23fabe2df1bb1905bf7502558522f52758b0aa9.
Revert "No need to load core_ext."

This reverts commit 1593cef7c7626c302bbb29a501ac1c41b7bafe8b.

The spec suite passes, but projects using minimapper requires some
parts of core_ext. Reverting for now.