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test version update Julia v0.6.2 / JuMP v0.18.0

version info update Julia v0.6, JuMP v0.17

Optim.minimizer(opt) — function API instead of fieldname

Merge commit '51ab4963ac1c10ae542cc0e839244c478a3b1da8'

# Conflicts:
#	code/chap3/myplot1.pdf
#	code/chap3/myplot1.png
#	code/chap3/plot1.pdf
#	code/chap3/plot1.png
#	code/chap4/fit_plot.pdf
#	code/chap4/fit_plot.png
#	code/chap8/iterations.png
#	code/chap9/iterations.png
#	images/basics/plot1.pdf
#	images/basics/plot1.png
#	images/lagrangian/iterations.png

Merge commit '51ab4963ac1c10ae542cc0e839244c478a3b1da8'

# Conflicts:
#	code/chap3/myplot1.pdf
#	code/chap3/myplot1.png
#	code/chap3/plot1.pdf
#	code/chap3/plot1.png
#	code/chap4/fit_plot.pdf
#	code/chap4/fit_plot.png
#	code/chap8/iterations.png
#	code/chap9/iterations.png
#	images/basics/plot1.pdf
#	images/basics/plot1.png
#	images/lagrangian/iterations.png