Merge branch 'release/0.1.4' into develop
switch to chai.expect for tests. HashMash.validate now returns undefined or the parsed object

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
bump version to 0.1.5

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
Merge branch 'release/0.1.5'