Follow transaction after sending it

Ghost User requested to merge am-send into master

Closes #4 (closed).

[Long gif, seems like the speed got decreased] demo-send

Notes:

  • The underlined blockchain in the gif points to the tx on etherscan, for users who want the txHash. dunno...
  • Wait for 6 confirmations before the user can do anything else.
  • Only send/receive ethereum for now. Tokens coming.
  • The 21000 value has been changed. Now I use common gasLimits (21k for eth transfer and 150k for token), and the gas price from 3 to 40 gwei. The value showed to the user is the total gas costs in ETH.

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