Bugfix for Fminbox, solver choice docs and maximization wrapper for optimize

Fix a sub2ind bug in Fminbox (this was removed in Julia 1.0)
Document solver choice advise
Introduce experimental support for a maximize convenience interface

Bugfix for Fminbox, better docs, and experimental maximize function

Fix a sub2ind bug in Fminbox (this was removed in Julia 1.0)
Document solver choice advise
Introduce experimental support for a maximize convenience interface

Julia v1.0 only release

Purges all v0.7 parts from the code.

v0.7 compatibility

Update .travis.yml (#656)

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

Minor cleanup, fminbox arbitrary precision bug fix, and doc typos

v0.15.3

Remove old linesearch fields from IPNewtonState convert (#652)

Minor bugfixes and improments

Doc strings, comments, small optimizations and API bug fixes.

Small fix for Fminbox API

v0.15.1

Allow for Options in Fminbox (#623)

Bounds and nonlinear constraints

This version includes a bounded simulated annealing algorithm, an interior point (Newton) solver for constrained optimization with nonlinear constraints, improved API for Fminbox, inplace keyword for optimize.

Additionally there are a few internal changes. We've simplified the complex number support, changed the line searches API, and a range of bug fixes.

JOSS Article

v0.14.1

JOSS

Relax convergence code, new Finite Differencing, f_tol counter

Relax code related to convergence check, to make it easier to base optimizers on Optim's architecture in external packages.

Switch to DiffEqDiffTools - introduce finite differencing for complex inputs

Introduce counter for successive function value increases