Rename all of the inconsistent files to the plural form

We had a lot of related files where some versions where named
in the singular and some in the plural.  We decided to
standardize them.  This commit simply renames the files; will
update the code in subsequent commits in hopes of preserving
diffs.
Fix all references to previously singular namespaces

Conflicts:
	src/com/puppetlabs/puppetdb/cli/export.clj
Merge pull request #647 from cprice404/maint/burgundy/pluralize-all-the-things

Rename all of the inconsistent files to the plural form