Spelling Bee: General spelling fixes + deprecations for 2.x series

This PR and branch is intended for general misspellings in the Lift API done in the
2.x series. These should:
 - Deprecate the old version with a note indicating what the correct version is and the
   fact that the misspelled version will be gone in Lift 3.0.
 - Delegate calls to the old version to the new, correctly-spelled version.

This for #1529.