Add pluggable versioning by mruby-version
Fix release date
replace Kernel.show_version with MRUBY_DESCRIPTION
Add global constant MRUBY_COPYRIGHT
Fix MRUBY_BIRTH_YEAR
introduce mrb_str_new_lit() to create strings from C string litrals
use mrb_str_new_lit() more widely
remove unnecessary semicolon
Merge pull request #1688 from cubicdaiya/issues/unnecessary_semicolon

Remove unnecessary semicolon
move version info from gems to core; ref #576 #1684
forgot to add new files
add MRUBY_RELEASE info in numbers
Remove notice of early version
Add download link for stable version to README

- add download link of stable version 1.0.0
- remove remark for mruby branch due to non-existence
rename mrb_name_class and make it static
made mrb_define_class to return existing class, with heavy refactoring
Merge pull request #1690 from bovi/patch-2

Add download link for stable version to README
Merge pull request #1689 from Bovi-Li/remove-notice

Remove *very early version* notice
forget to add function prototypes
Store raw stack address in callinfo instead of offset from stbas