Fix multi line exception messages not matching on anything but the first line in tests.
Fix testing for a floating value that depends on precision.
add force covers in tests.
Add Arrays::ofScalars filter
Add Arrays::ofArrays filter
Merge pull request #16 from gaillard/master

Add ::ofScalars, ::ofArrays filter and fix a few test bugs, and use force covers
Add hhvm testing on travis ci.