3.0.0: 1D noise support

• Added a 1D gradient noise function (GradientNoise).
• Updates from the original webgl-noise repository.
• Updated the normalization factor for the classic noise functions.

2.0.1: Updates from webgl-noise

• Pulled an update from the original webgl-noise repository to adjust a constant in the permutation function, slightly improving randomness (albeit imperceptibly).

Total refactoring

• Removed the BCCNoise functions.
• Rewrote the webgl-noise functions to use more modern and simpler way to generate gradients.
• Function renaming: snoise -> SimplexNoise, cnoise -> ClassicNoise, pnoise -> PeriodicNoise
• Added include guards. Now you can use these shaders without conflicts.
• Changed the normalization coefficients. Now these noise functions return values roughly fit in [-1, +1].