Add support for dynamically setting segment.io key.
update version for npm

We'll put this version on npm. Need to update version.
fix historic sync
Merge pull request #331 from maraoz/bug/fix-historic-sync

fix historic sync
Merge pull request #330 from ryanxcharles/feature/bump-up-version

update version for npm -- Great!
fix tests
Merge pull request #333 from matiu/bug/fix-tests

fix tests
Update README.md
add max open files
Merge pull request #334 from matiu/bug/max-openfiles

add max open files
add concurrency limit
Merge pull request #335 from matiu/bug/add-limit-to-async

add concurrency limit
Merge pull request #336 from martindale/feature/analytics

Add Segment.io Config
remove parsing txs from RPC
smaller page length for TXs in blocks and address
option to skip double speed confirmations
Merge pull request #343 from matiu/feature/refactor-rpc-txs

Feature/refactor rpc txs
fix block reward
Fixed wording for unspent/spent outputs
fix working for spent, also in var names