fix capture group index bug

mruby.h: simplify ctype-like macros

atoi() is used to convert the index to an int but the behavior is
undefined if the value can't be represented.

> $9999999999
00007 NODE_SCOPE:
00007   NODE_BEGIN:
00007     NODE_NTH_REF: $2147483647
irep 00630580 nregs=2 nlocals=1 pools=0 syms=1 reps=0
file: (mirb)
7 000 OP_GETGLOBAL  R1      :$2147483647
7 001 OP_STOP

Call strtoul() instead as its behavior in such cases is defined and add
a simple range check.

Alternatively NODE_NTH_REF's cdr could be changed from int to mrb_sym
(like NODE_GVAR).

Not needed anymore since 85075bef

Reduces the file size (by up to 2 KB with VS2015 RC, /O2, /MD) and
removes the requirement of including <ctype.h> before their usage.
Multiple macro argument evaluation and lack of type-checking is still an
issue.

Move "src/mrb_throw.h" to "include/mruby/throw.h".

Related to #2760.

Move `mrb_codedump_all` to "src/codedump.c".

Add null check on lex_strterm in heredoc block

Related to #2760.

Add locals null checks

Verify that proc_lambda is passed a proc

remove an always-true conditional.

String#split fails to split on second or later separator

Link documents

Fix build mruby for NetBSD

fix type of mrb_exc_new()'s len parameter

mrb_str_new() takes size_t, so should mrb_exc_new().

remove SET_PROC_VALUE() macro

It isn't used anymore since the #2791 merge. It's also unlikely to be
needed again as it wasn't before (its usage was unnecessary).

Use `mrb_funcall` instead of `mrb_load_string` in test driver.

let the C compiler validate the identifier

remove mrb_define_method_vm() function

Update Coopyright Information to year 2015

Some C compilers may allow other characters in identifiers such as $.
They may also implement C99's extended identifiers (\u30EB\u30D3\u30FC,
ルビー).

It isn't needed as it's very similar to mrb_define_method_raw() and also
there's only one place where mrb_proc_ptr() actually has to be called.

Inspired by @furunkel's method cache patch (#2764).

Related to #2760.

Reenable mrb_dump_irep under DISABLE_STDIO.