[DOC] update docs to reflect validated query parameters in submitting payments, granting trust lines, and updating account settings. Also updated granting trust lines and updating account settings response format.
[DOC] add documentation for paging in GET /balances and GET /trustlines
Merge pull request #91 from boxbag/last-ledger-sequence-docs

[DOC] update docs to reflect validated query parameters in submitting payments, granting trust lines, and updating account settings. Also updated granting trust lines and updating account settings response format.