Fixed following issues
#1639 : Fixed ```description``` to have "In JavaScript" instead of "in JavaScript" and added punctuation.
#1640#1641 Added punctuation and fixed typo to have "perform mathematical functions" instead of "preform mathematical functions".
Change challenge description of "Bonfire: Where art thou", to fix issue #1644. Changed description to say "an array" instead of "a list" to make it clear and less confusing.
Update main.less to fix#1510. There was an alignment issue on Safari because of missing vendor prefix ```-webkit``` on ```transform``` on the ```.points-on-top``` class.
Shouvik Roy