megaman v0.1: manifold learning for millions of points

Initial release of megaman, containing scalable algorithms for manifold learning including:

• Locally Linear Embedding
• Local Tangent Space Alignment
• Isomap
• Spectral Embedding

These algorithms use FLANN, PYAMG, LOBPCG, ARPACK, and other fast libraries to power through the computational hurdles of manifold learning algorithms.