Ignore gh-pages dir

Otherwise it may get pushed to npm during publishing.
Fix issue with callback being undefined on error
Optimise the customParser wrapper
Fix issue with missing identifier throwing sooner than expected

...and throwing something else than expected.
No longer require identifier if only one LED is present
Update README badges

[ci skip]
Use custom jsdoc template, looks nicer
Update gh-pages commit message from Travis builds
Minor docblock fixes
0.1.3