fdtrack: hide message

rpc/comms: reconnect ipc client after write error

p2p, p2p/discover: small fixes 

This reverts commit 5c949d3b.

eth: fix an issue with pulling and inserting blocks twice

PR #1621 changed Table locking so the mutex is not held while a
contested node is being pinged. If multiple nodes ping the local node
during this time window, multiple ping packets will be sent to the
contested node. The changes in this commit prevent multiple packets by
tracking whether the node is being replaced.

Might solve #1579

cmd/geth: Fix chain purging from cmd line

crypto: remove obsolete code

Switch from Coveralls to Codecov code coverage service

Updated README, Added CONTRIBUTING

core, miner: write miner receipts

rpc/api: return boolean value for eth_submitHashrate

rpc: update the xeth over RPC API to use the success/failure messages

GPO update

rpc/api: format pendingTx response. Fixes #1648

Added SG bootnode

jsre: pretty printer improvements

xeth: call fix when doing 'create'-like calls

The pretty printer, dumb as it is, printed arrays of objects as

  [{
    ...
    }]

With this change, they now print as:

  [{
    ...
  }]

xeth: added a transact mu

Javascript --exec output

Added a transact mutex. The transact mutex will fix an issue where
transactions were created with the same nonce resulting in some
transactions being dropped. This happened when two concurrent calls
would call the `Transact` method (which is OK) which would both call
`GetNonce`. While the managed is thread safe it does not help us in this
case.

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