integration developer-gateway with oasis-client

[eauge]

• [x] Confidential contracts with developer-gateway failed to deploy. The web3 gateway reports a status 0 on the transaction receipt [ ]
• [ ] Subscriptions sometimes hang. It seems that the client stops sending /event/pool requests
• [x] Potential errors on the deserialization of outputs for solidity contracts

  
  /Users/estanislauauge-pujadas/Workspace/src/github.com/oasislabs/runtime-ethereum/e2e-tests/e2e-tests/node_modules/mocha/lib/runner.js:707
  err.uncaught = true;
             ^

TypeError: Cannot create property 'uncaught' on string 'Remaining bytes' at Runner.uncaught (/Users/estanislauauge-pujadas/Workspace/src/github.com/oasislabs/runtime-ethereum/e2e-tests/e2e-tests/node_modules/mocha/lib/runner.js:707:16) at process.uncaught (/Users/estanislauauge-pujadas/Workspace/src/github.com/oasislabs/runtime-ethereum/e2e-tests/e2e-tests/node_modules/mocha/lib/runner.js:821:10) at process.emit (events.js:182:13) at process.emit (/Users/estanislauauge-pujadas/Workspace/src/github.com/oasislabs/runtime-ethereum/e2e-tests/e2e-tests/node_modules/truffle-oasis/build/webpack:/~/source-map-support/source-map-support.js:461:1) at process._fatalException (internal/bootstrap/node.js:494:27)

[armaniferrante]

Related: https://github.com/oasislabs/e2e-tests/issues/97