All verbs are now secured.
Implemented the xp2:not() function for s-ramp queries.
Added two convenience methods on the s-ramp client.
Changed artifact delete to be a logical rather than a hard delete.  The
artifact JCR node is now stripped of its sramp mixin type and moved from
/s-ramp/ to /s-ramp-trash/.  The move isn't strictly necessary but it
was an easy way to make sure getArtifact wouldn't be able to find it.
Merge pull request #263 from EricWittmann/dtgov-19-head-auth

(dtgov-19) Enable auth for HEAD
Merge pull request #264 from EricWittmann/sramp-165-not-function

(sramp-165) Implemented the xp2:not() function for s-ramp queries.
Merge pull request #265 from EricWittmann/sramp-137-client-api

(sramp-137) Add getArtifactMetaData(ArtifactSummary) to the client api
Merge pull request #266 from EricWittmann/sramp-160-logical-delete

(sramp-160) Change artifact's 'delete' action to be a logical delete