valid Jasmine .toExpect() syntax and ntide counts

The previous refactoring introduced a spec pattern of `expect(a, b)` which gives false positives, instead of the valid `expect(a).toEqual(b)`. Also, the nucleotide counts for C and G in one of the specs were reversed.
fixed example.js to count nucleotides correctly

previous example.js used `count.bind` when count was expecting two variables, not a single variable and `this`. Corrected so it simply calls `count(a,b)` and confirmed it passes now.
removed temporary commenting-out of module.exports

Accidentally left in the comment (used temporarily for testing)
Merge pull request #36 from glebec/master

Nucleotide-counts.js spec fix (for false positives) and example.js fix (for correct ntide counts)