Resolve "Newton constant and Mass of the Sun"

Closes #5 (closed)

Adds the following constants

• ELEMENTARY_CHARGE, e
• BOLTZMANN_CONSTANT, Kb
• STEFAN_BOLTZMANN_CONSTANT
• VACUUM_PERMEABILITY
• FUSED_SILICA_THERMAL_OPD
• FUSED_SILICAL_THERMAL_EXPANSION
• CRYSTAL_QUARTZ_THERMAL_OPD
• ZERODUR_THERMAL_EXPANSION
• TITANIUM_THERMAL_EXPANSION
• GOLD_PLATINUM_THERMAL_EXPANSION
• WATER_MOLECULAR_WEIGHT