format numerator/denominator numbers in results dashboard

e.g., 3,025 -> 3k, 4,598,445 -> 5m, small numbers stay the same
add test for fraction abbreviation
increase precision in numeral abbreviations to single decimal

e.g., 7203 -> 7.2k, 8389845 -> 8.4m
Making sure that small integers do not show a decimal place.

Previously, a number like '1' would display as '1.0'
Merge pull request #143 from pophealth/abbreviate_measure_fraction

Abbreviate measure fraction within dashboard results