[BUG] merge IE11 signature fix
Merge remote-tracking branch 'upstream/develop' into develop
Broadcast transaction submission requests, use average server fee
[FEATURE] support numeric currency codes

ISO 4217 states support for both alphabetic and numeric codes. rippled adheres to the ISO 4217 as stated in the Currency_Format on the wiki (https://ripple.com/wiki/Currency_Format) and there are trustlines out there with numeric currency codes.

The three-digit numeric code is useful when currency codes need to be understood in countries that do not use Latin scripts and for computerised systems. Where possible the 3 digit numeric code is the same as the numeric country code.
Merge pull request #87 from geertweening/feature/numeric_currency_code

[FEATURE] support numeric currency codes
Merge remote-tracking branch 'upstream/develop' into develop
[CHORE] Move HTTP request signing functionality into its own class.
[FEATURE] Add ability to calculate ledger entry keys.
Uncomment reconnect logic
Merge pull request #88 from justmoon/feature/generate_ledger_entry_indexes

Generate ledger entry indexes
[DEBUG] multiple bug fixes with blob creation
[FEATURE] add getter for a Currency's iso_code
Use median rather than average transaction fee
Cleanup
Merge pull request #90 from geertweening/feature/iso_code

[FEATURE] add getter for a Currency's iso_code
Merge remote-tracking branch 'upstream/develop' into develop
[CHORE] refactored identity functions necessary for ripple client integration
Merge pull request #89 from ripple/multi-server

Multi-server update
Merge remote-tracking branch 'upstream/develop' into develop
[FEATURE] expose AuthInfo and RippleTxt modules in ripple class