Fixes for structured LBFGS approximation.#38

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lambe wants to merge 5 commits intoPythonOptimizers:developfrom

Commits on Dec 13, 2016

Bugfixes to Structured LBFGS approximation.
Andrew Lambe
committed

Commits on Dec 15, 2016

Refactored structured LBFGS matvec function to fix a major bug.
Andrew Lambe
committed

Commits on Jan 13, 2017

Modified structured LBFGS operator to suppress Python runtime
Andrew Lambe
committed

Commits on Jan 14, 2017

Major bugfix and code cleanup in structured LSR1 operator.
Andrew Lambe
committed
Refactored structured LBFGS operator for clarity in the matvec.
Andrew Lambe
committed