[TASK] bump version to 0.8.1
Allow mixed letters and numbers in currencies
Add potential missing error handlers
Fix orderbook reset on reconnect
[TASK] update release notes
[TASK] bump version to 0.8.2-rc1
Deprecate account_tx map/reduce/filter
Emit server with subscription events
Fix requestLedger arguments
Merge branch 'release' into develop
[DOC] update release notes
[TASK] bump verison to 0.8.2-rc2
Update docs/GUIDES.md
Merge pull request #172 from booxood/modify-docs-guides-md

Update docs/GUIDES.md
[TASK] bump version to 0.8.2
[FIX] change handling of requestLedger options

ledger_index and ledger_hash were being set to true
instead of the specified value, and according to API
docs 'closed','validated', and 'current' can be
supplied to the ledger_index field to get the most
recent of the specified type
Merge pull request #176 from shekenahglory/develop

[FIX] change handling of requestLedger options
configurable maxAttempts
Merge pull request #178 from ripplerm/develop

configurable maxAttempts