Moved mrbgems examples
Merge pull request #783 from masuidrive/move_mrbgems

Moved mrbgems examples
Fixed mrbc file ext on host
Modify code blocks
Fix some styling of the documentation
Fixes a number of "comparison between signed and unsigned" warnings.
Removed tests that look outdated. The mrb_compile_string they use is gone now.
Merge pull request #787 from carsonmcdonald/unittestcleanup

Removed tests that look outdated.
Merge pull request #785 from bovi/readme

Improve Documentation
Merge pull request #786 from carsonmcdonald/unsignedfixes

Fixes a number of "comparison between signed and unsigned" warnings.
Merge pull request #784 from masuidrive/fix_mrbc_ext

Fixed mrbc file ext on host
remove bin/command first to avoid text file busy