We have do this because mruby's test files are found using MRUBY_ROOT, like this:
    mrbs = Dir.glob("#{MRUBY_ROOT}/test/t/*.rb")

Removed old mrbgems_test.rake which was merged into mrbgem spec

Remove duplicated RARRAY_LEN check in ary_elt

Remove non-need tmp value in mrb_obj_to_sym

Add build on Trusty and OS X

The default 6.1 was slow

be able to source with :path for mrbgems

pop cmdarg in lambda body; fix [ruby-bug#11380]

regression introduced by 2fe556d9

mrbgem compile should be depend on mrbgem.rake

Shallow clone mgem source

update mrbgems doc

fix android compile bug : uninitialized constant GCC_VERSION

Add ability to change compiler versions for androideabi