version bumps
add a build command
move some utility vars out of the exported class

The Hamming Weight constants and functions, as well as two other
functions, did not need to be defined per instance or in the module
export.
update test command to work with coffee-script@1.8
major performance improvements to next/previous

By skipping empty and full words, and picking the next or previous bit
without iterating each bit in the word, the next and previous functions
are now around 37x faster. This commit also adds some new test cases and
extracts some of the more convoluted functions into their own modules.
trim comments to 80 columns