Fix a catchall exception handler warning in actor.
Fix an implicit conversion feature warning.

Not sure what JsonCommand is for to begin with, but that’s
a separate question.
Import implicitConversions as needed in util.
Fix minimizeEmpty deprecations in util.

Elem has an extra required parameter in its constructor.
Import postfixOps as needed in lift-util.
Implicit conversions->implicit classes in util.
Drop some deprecated implicits to nuke warnings in util.
Import higherKinds as needed in util.
Import reflectiveCalls as needed in util.
Fix catch-all exception warnings in util.
Fix reference to Manifest.erasure in util.
Fix inferred existential type in util.

We are now explicit about the wildcard type.
Fix val in for comprehension in util.
Fix pure expression warning in CssSel.
Merge pull request #1535 from lift/utilitarian-actors

Utilitarian Actors: Fix src warnings in lift-actor and lift-util