Rename to --smtlib2-compliant; Support (get-option)

[soonho-tri]

Close #217

[soonho-tri]

@LeventErkok,

• I've changed the option name to --smtlib2-compliant or (: smtlib2-compliant or : smtlib2_compliant). FYI, Z3 is usingsmtlib2_compliant`.
• (check-sat) still returns delta-sat without information about its precision. But you can execute (get-option :precision) to get it.
• (set-option :produce-models true) does not print a model when --smtlib2-compliant is on.

Please let me know what you think about the above points.

[codecov[bot]]

Codecov Report

Merging #220 into master will decrease coverage by 0.16%. The diff coverage is 4.76%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
- Coverage   61.63%   61.46%   -0.17%     
==========================================
  Files          93       93              
  Lines        4356     4368      +12     
==========================================
  Hits         2685     2685              
- Misses       1671     1683      +12     

Impacted Files	Coverage Δ
dreal/solver/config.cc	41.93% <0.00%> (-0.69%)	:arrow_down:
dreal/solver/context.cc	29.31% <0.00%> (-1.05%)	:arrow_down:
dreal/solver/context_impl.cc	63.88% <0.00%> (-2.37%)	:arrow_down:
dreal/solver/context_impl.h	83.33% <ø> (ø)
dreal/solver/config.h	95.00% <100.00%> (ø)

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