0.9.0.dev6

Fixes

• Fix numpy version range
• BQM.get_quadratic now has consistent/correct behaviour when a default is provided
• Restored some removed methods, BQM.to_coo, .from_coo, .to_numpy_matrix, .from_numpy_matrix, .to_networkx_graph, .from_networkx_graph
• BQM.energies now raises the correct exception when given bad samples

New Features

• Binary quadratic models can now be constructed from linear/quadratic iterators
• BQM.base attribute to help when constructing from views
• BQM.energies mixin now uses a faster numpy-based energy calculation