Fixes the doc building, new type syntax ((mutable) struct), reorganization of code, quit loops over dot syntax for readability, and fix Fminbox such that it is properly deprecated.

Fixes the doc building, new type syntax ((mutable) struct), reorganization of code, quit loops over dot syntax for readability, and fix Fminbox such that it is properly deprecated.

Added UninitializedObjective to ease transition from older versions. Also fixes two bugs in ParticleSwarm.

Optim v0.9.0

• Drop support for Julia versions less than v0.6.0-pre
• Fminbox: If an initial guess is on the boundary of the box, the guess is moved inside the box and a warning is produced, as opposed to crashing with an error.
• Significant changes to the Non-, Once-, and TwiceDifferentiable setup; these now hold temporaries relevant to the evaluation of objectives, gradients, and Hessians. They also hold f-, g-, and h_calls counters
• Refactor tests
• Drop v0.4 supporters
• Add limits to f-, g-, and h_calls
• Improve trace for univariate optimization
• Changed order of storage arrays and evaluation point arrays in gradient and Hessian calls
• Skip v0.8.0 to allow fixes on Julia v0.5.0

Upper limit on LineSearches.jl in REQUIRE and not just in METADATA.jl.

Necessary to avoid Optim being downgraded due to version bounds conflicts.

This is a fix for the METADATA mess from https://github.com/JuliaLang/METADATA.jl/pull/7295