Adding new getCreator and getOldestRevision methods to WikiPage class.

Adding new getCreator and getOldestRevision methods to WikiPage class.

Patch 2: Adding getOldest method per comments
Patch 3: whitespace fix
Patch 4: renaming getOldest to getOldestRevision
Patch 5: separating into 3 methods: getOldestRevisionId, getOldestRevision, getCreator
Patch 6: more concise, fixing whitespace
Patch 7: return user object instead of user id
Patch 8: consolidating revision methods per discussion
Patch 9: whitespace
Patch 11: better commit summary
Patch 12: Typo, sigh
Patch 13: switching to use Revision::newFromRow per comment
Patch 14: using Revision::selectFields()
Patch 15: moving outside of while loop
Change-Id: I140e17a95b89c9263978942fd642d6a236a5cc4f