make test/assert.rb cruby compatible
add test/bintest.rb
add conf.enable_bintest and run_bintest
add regression for #1564
add regression for #1572
add regression for #1563
enable bintest for travis CI
add a comment for enable_bintest in build_config.rb
Fix build error for MRB_WORD_BOXING
Merge pull request #1599 from kyab/fix_mrb_word_boxing

Fix build error for MRB_WORD_BOXING
float objects in pool are objects when MRB_WORD_BOXING is set
rename mrb_intern2() to mrb_intern(); huge API incompatibility; close #1513
inline mrb_gc_arena_restore() and stack_extend() in VM loop
add mrb_intern_lit for creating symbol from string literal
Merge pull request #1600 from take-cheeze/mrb_intern_lit

Proposal of mrb_intern_lit macro.
Change scapa and rcapa to size_t, use scapa.
Merge pull request #1601 from carsonmcdonald/srcaptosizet

Change scapa and rcapa to size_t, use scapa.
should not access scope after releasing memory pool
avoid top-level pool release at codegen_error() and fixed some memory leaks
Add is_a? test to cover issue 1477