reimplement EvideHandlers and GovProposalHandlers #57
Description
#50 removed EvidenceHandlers and Gov proposal handlers (CLI and Rest only) they need to be re-introduced with a strategy that does not involve the legacy rest API.
ref: https://github.com/allinbits/cosmos-sdk/pull/50/files#diff-db0e3dd56cdf8377125c922697fd790fd07078cb66ea41ffade624338b45462dR82
ref: https://github.com/allinbits/cosmos-sdk/pull/50/files#diff-cbc3a77fd9ac8e383db854c09d059df2573d8b0ee98b3189d1e59b01bc47c1b5L42