Change the "main" path to actual main file.

lib/index.js doesn't exist. Main should be requiring lib/creditcard.js instead.
Merge pull request #1 from ovaillancourt/patch-1

Change the "main" path to actual main file.
[minor] Using a lib folder for 1 file is stupid
[fix] Removed dead code
[fix] Added pre-commit hook
[dist] 0.1.0
[minor] Regenerated the documentation
[fix] dont bailout if we actually supply a month
[dist] up v.0.1.1
[test] actually check the expected value
[minor] Added missing known test number for Dankort
[minor] It seems that not all known test numbers are valid.
[minor] add recurly test numbers