Add Fiber Test for issue #1264
Merge pull request #1265 from bovi/add-fiber-test

Add Fiber Test for issue #1264
fix fiber GC problem
mruby error messages should be directed to stderr
Add MRB_WORD_BOXING mode (represent mrb_value as a word)
Merge pull request #1266 from kimushu/feature/word-boxing

Add MRB_WORD_BOXING mode (represent mrb_value as a word)
Merge branch 'master' of github.com:mruby/mruby
add Fiber#alive?
Merge pull request #1267 from skandhas/pr-add-Fiber-alive_p

add Fiber#alive?
Add test for raise on resume after fiber is dead
Test for raise when yield is called on root fiber
Merge pull request #1268 from carsonmcdonald/fiberextests

Add a couple Fiber tests
small refactoring over word boxing
Merge branch 'master' of github.com:mruby/mruby
Minor wording changes and a couple spelling fixes
Merge pull request #1271 from carsonmcdonald/mrbgemdocfixes

Minor wording changes and a couple spelling fixes
Describe GemBox files can be located anywhere
No need to specify empty bin list anymore(example)
do not specify implementation dependant exception class names in fiber test
install gperf to prevent accidental compile error