Tighten validation of meter data
Tighten validation of meter data

Use `Number()` instead of `parseInt()` to parse readings.
Add regex to validate timestamps.

beloitcollegecomputerscience/OED,beloitcollegecomputerscience/OED,OpenEnergyDashboard/OED,OpenEnergyDashboard/OED,beloitcollegecomputerscience/OED,OpenEnergyDashboard/OED,OpenEnergyDashboard/OED,beloitcollegecomputerscience/OED