Fix mod.constants cannot return the single character constant
Merge pull request #1606 from bggd/patch-1

Fix mod.constants cannot return the single character constant
modify test case to check #1606
Avoid recursive instance variable inspections
Merge pull request #1607 from h2so5/avoid-recursive-inspection

Avoid recursive instance variable inspections
Fixed callinfo buffer overflow while calling ensure handlers
Merge pull request #1608 from nanamiwang/vmcrash

Fixed callinfo buffer overflow while calling ensure handlers
Update the INSTALL information to be more accurate
Merge pull request #1609 from carsonmcdonald/updateinstallinfo

Update the INSTALL information to be more accurate
Fix typo from expornent to exponent

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
fix TypeError message
fix codegen bug in NODE_CASE
Merge pull request #1610 from mruby-debian/for-upstream

Fix typo from expornent to exponent
Merge pull request #1611 from h2so5/inspect-type

fix TypeError message
Merge pull request #1612 from h2so5/node-case

fix codegen bug in NODE_CASE
add some tests for case statements
Merge pull request #1613 from h2so5/test-case-statements

add some tests for case statements
change behavior of mrb_sym2str
Remove 'mrb_state' field from 'kh_xxx_t' structure.

'kh_xxx_t' requires 'mrb_state' to allocate, free, and compute hash value.
But 'mrb_state' should not be held by 'kh_xxx_t' and 'mrb_state' should be
supplied from outside.
Merge pull request #1614 from h2so5/change-sym2str

change behavior of mrb_sym2str