Merge pull request #2266 from suzukaze/fix-indent

Fix indents
Replace tab with spaces.
Delete unnecessary semicolon
Use boolean macro
Use boolean macro in mrb_range_initialize()
Merge pull request #2268 from yui-knk/replace-tab

Replace tab with spaces.
Merge pull request #2269 from suzukaze/delete-semicolon

Delete unnecessary semicolon
Merge pull request #2270 from suzukaze/refactor-class.c

Use boolean macro
Merge pull request #2273 from suzukaze/refactor-range.c

Use boolean macro in mrb_range_initialize()
Refactor mrb_str_new() in string.c
Refactor mrb_str_equal_m in string.c
Refactor mrb_str_intern() in string.c
Merge pull request #2275 from suzukaze/refactor-string.c-2

Refactor string.c Fix #2267
Add comment to Fixnum Class.
Merge pull request #2276 from yui-knk/add-comment

Add comment to Fixnum Class.
Fix indent in mrb_hash_to_hash()