Adding DSpace REST API from DSpace/DSpace#323 to our 1.8.x

See also: https://github.com/DSpace/DSpace/pull/323
Add improvements to REST-API from Anja DSpace/DSpace#356, except for stats to 1.8.x

Was able to add some of the improvements made by Anja with DSpace/DSpace#356
However, due to imcompatibilities with where UsageEvents / SOLRStats, and
Spring and DSpace Services 4.0, I had to yank out the statistics portion,
since it was causing too much grief. i.e. ehcache issues, no thank you.

https://github.com/DSpace/DSpace/pull/356
Merge pull request #10 from osulibraries/osu-rest

Backporting DSpace REST API from DSpace 4.0 into our 1.8.x branch