Merge branch 'master' of github.com:ripple/gatewayd
[FIX] check if payment object has a source_tag
Merge pull request #185 from ripple/hot-fix-source-tag

[FIX] check if payment object has a source_tag
[TASK] add success status, change camel case to _
[TEST] test successful request
[TASK] pass payment object as an argument
[TASK] pass options as argument
[TASK] pass status code, spell response out
[TEST] pass options object
[TEST] break up object
[DOC] update fund hot wallet request  and response
[DOC] remove curl command
[DOC] update fund hot wallet request  and response
[TASK] remove unused modules
[TASK] remove console.log
Merge pull request #187 from ripple/test-http-fund-hot-wallet

Test http fund hot wallet
[FEATURE] Test and add EnqueueOutgoingPaymentError class.
[FEATURE] Add gateway.errors global object.
[FEATURE] Add enqueue_outgoing_payment core api call.
[DOC] Add Enqueue Outgoing Payment HTTP API Docs.