test => empty string
test => start with #
test => capitalize
test => join words
test => capitalize all words
test => final result longer than 140
test => input longer than 140,but result less than 141
test => drop all whitespace
Merge branch 'the_hashtag_generator' into master
add test into all-tests.html
fix bug => drop tailing whitespace
Merge branch 'the_hashtag_generator'