add Enumerable#first to mruby-enum-ext
add unit tests for NilClass
Merge branch 'master' of github.com:mruby/mruby
refactor Enumerable#{all?,any?} tests
move summary of mrbgems in default gembox to its spec
print gem summary in print_build_summary method
add summary to mrbgems without it
don't show version '0.0.0' in build summary since it's default version
Enumerable#entries to support multiple values; close #1868
make Enumerable methods to support multiple values; collect, detect, each_with_index, find_all, inject, max, min, partition, reject, sort
add Enumerable#sort_by
Refactor Enumerable#all?
Refactor Enumerable#any?
Refactor Enumerable#include?
Merge pull request #1875 from akuroda/pr_nil_test

add unit tests for NilClass
Merge branch 'master' of github.com:mruby/mruby
Merge branch 'refactor-enumerable.rb' of https://github.com/suzukaze/mruby into suzukaze-refactor-enumerable.rb
Merge branch 'mrbgem_summary' of https://github.com/take-cheeze/mruby into take-cheeze-mrbgem_summary
recover description in default.gembox