in the marking root phase, we only marked the root context, but leaving
the current context unmarked. when we execute a fiber, the current
context would be changed and trigger this issue.

Add travisci badge

muby-time: use mrb_free directly

Custom build path pulls git gems for every build target

[mrbtest] assert_equal(expect, actual) order fix

Set filename like irb

End loop if nextc is -1

I fix order of expected and actual from basicobject.rb to true.rb in folder '/test/t'.