Added new quantity, power
Added new quantity, frequency
Added method for converting quantity to measure of native unit
Merge pull request #4 from ojhaujjwal/feature/frequency

Added new quantity, frequency
Merge pull request #8 from ojhaujjwal/feature/native-conversion

Added method for converting quantity to measure of native unit
Merge pull request #3 from ojhaujjwal/feature/power

Added new quantity, power