Fix account_lines, account_offers and book_offers result (RIPD-682):
The RPC account_lines and account_offers commands now respond with the correct ledger info.
account_offers, account_lines and book_offers allow admins unlimited size on the limit param.
Specifying a negative value on limit will be clamped to the minimum value allowed.
Incorrect types for limit will be correctly reported in the result.

Conflicts:
	src/ripple/rpc/handlers/AccountLines.cpp
	src/ripple/rpc/handlers/AccountOffers.cpp
	src/ripple/rpc/handlers/BookOffers.cpp
	src/ripple/rpc/handlers/Subscribe.cpp