Remove content-type as a first-class citizen.
Update Documentation to reflect content-type removal.
Transactiooooons
Transaction stuff.

- Added failing transaction test.
- Added handy gdb thing for tests.
- Some initial transaction support in the DB.
Started replicating the API for transaction use.
Merge branch '118_Transaction_Support' of github.com:infoforcefeed/OlegDB into 118_Transaction_Support