CORE-3929: switched from clojure.data.json to cheshire
upped dependencies and increased version

clojure -> 1.5.1
clojure-commons -> 1.4.1-SNAPSHOT
clj-jargon -> 0.2.4-SNAPSHOT
Added the /paths-contain-space endpoint.
Fixed up the /substitute-spaces endpoint.
Fixed a sorting issue when processing the parent directories.
Renamed /substitute-spaces to /replace-spaces.
Added docs for /replace-spaces.
Merge branch '1.6.2' into 1.8

Conflicts:
	project.clj
	src/nibblonian/controllers.clj
	src/nibblonian/error_codes.clj
	src/nibblonian/irods_actions.clj
Fixed dependencies on clj-jargon that I screwed up in the merge.
Merge branch '1.6.2' into 1.8

Conflicts:
	project.clj
Cleaned up some useless tests.
Added /read-chunk and the docs to go with it.
Update read-chunk.md
Added the /overwrite-chunk endpoint along with its docs.
Added a validation check to make sure that a file is being read for the
read-chunk endpoint.
CORE-4145: If a path is URL encoded when doing an existence check, it
will be decoded before the check is performed.
Added some spacing.
CORE-4181: Fixed the labeling of top-level directories.
CORE-4181: Fixed the Shared With Me label.