page validator for dev node

[clearloop]

Tasks

• generate pfp for validator
• the path of validators should be /validator/{hash}
• remove validator index overview
• incorrect data
  • total blocks
  • total tickets
  • total epochs involved
• tab epoch history
  • paginations of epoch history
  • display validator index in specified epoch
  • limit (10) the epochs displayed in epoch history chart
  • entry for /epoch/{number}
• Hide the activity tab
• Hide statistics

[sunhuachuang]

Added totalBlocks, totalEpochs, totalTickets to Validator spacejamapp/explorer#16