Partially reverted https://github.com/ansman/validate.js/commit/bebe8…

[huan086]

…8ed9a40c38a37f44611650b68710e85cee1 to allow "" but reject whitespace, for all validators except equality.

The current behaviour without this commit causes all fields to be required, even without the presence.

[coveralls]

Coverage remained the same at 100.0% when pulling 7b5a991 on huan086:master into d7f6baa on ansman:master.

[coveralls]

Coverage remained the same at 100.0% when pulling fc331ea on huan086:master into d7f6baa on ansman:master.

[ansman]

@huan086 I feel like validate.js should a global setting wether to consider empty string, arrays and objects empty or not.

Ideally presence should capture everything that the other validators lets though. As it is now you can have values that falls through the cracks.

[coveralls]

Coverage remained the same at 100.0% when pulling 191f9ca on huan086:master into ab5ad5a on ansman:master.