Change task rule based on build_dir so main rules don't clobber gem rules.
Ignore empty gem
Merge pull request #828 from mattn/ignore_empty_gem

Ignore empty gems
Merge pull request #825 from carsonmcdonald/gembuildfix

Change task rule based on build_dir so main rules don't clobber gem rules
Fix incorrect index use. nerr was being used for warning buffer check.
Merge pull request #830 from carsonmcdonald/warncheckfix

Fix incorrect index use. nerr was being used for warning buffer check.
Don't overwrite ciidx if it is already set.
Add documentation for Android toolchain
add mrbtest verbose mode ('-v' option)
"for i in (1..12/5); p i ; end" should not print "3"
Merge pull request #832 from bovi/compile-readme

Add documentation for Android toolchain
Merge pull request #833 from iij/pr-mrbtest-verbose

add mrbtest verbose mode ('-v' option)
Merge pull request #831 from carsonmcdonald/ciidxfix

Don't overwrite ciidx if it is already set.
Merge branch 'master' of github.com:mruby/mruby
should adjust stack size when irep->nregs is larger than allocate size; close #835
add mrb_str_to_cstr
Merge pull request #836 from iij/pr-mrb_str_to_cstr

string contains null byte check utility function (mrb_str_to_cstr)
Update doc/compile/README.md
Added String#sub/sub! and String#gsub/gsub!
Merge pull request #838 from brainopia/patch-1

Fix typos in compilation guide