Add float.h. It exists even if the environment was freestanding. It has been supported since C89.
Add a new function mrb_flo_to_str(). Use it instead of sprintf() as possible.
implement literal %W %w %s
refactor string parsing
Could you add me to AUTHORS?
refactor heredoc identifier
remove disused check code
bugfix about escaping '\n'
Merge pull request #1020 from monaka/pr-add-numeric-format-function

Add numeric format function
personal style preference on function call in flo_to_s
Merge pull request #1025 from FUKUZAWA-Tadashi/master

implement %W %w %s
remove unused local variable beg in parser_yylex
Optimize OP_ADD instruction.
Optimize OP_SUBI.
Remove mrb_checkstack() as unused.
Make some tiny functions inlined. This is for supeed tuning.
Extract uvget/uvset to OP_GETUPVAR/OP_SETUPVAR. This is for speed tuning.
Make topenv() inlined.
Clean some redundant code up.
Lazy variable declarations. They are for speed tune.
Simplify conditional expressions. This is for speed tuning.