Add Blaze as an option for finding eigenvalues

[penguian]

GluCat uses uBLAS for linear algebra, except for finding eigenvalues, where it uses Boost Bindings. The two different libraries use different matrix formats. Also, uBLAS is quite slow, especially for algorithms such as the addition of compressed matrices. Perhaps Blaze would be better for finding eigenvalues? First step is to add it as an option alongside Boost Bindings.

[create-issue-branch[bot]]

Branch issue-45-Add_Blaze_as_an_option_for_finding_eigenvalues created!

[penguian]

Closed by PR #47