start of async io support. Started by creating a stacklet queue
implemented lightweight threads
Merge branch 'master' into async-io
we can dispatch to libuv, although the timeout values seem borked
latest work
very rough wip, but run_blocking works
add more string functions

index-of, upper-case, lower-case, capitalize, trim, triml, trimr
initial character literal support
more work on async-io
some cleanup
Merge branch 'master' into async-io
remove unnecessary unicode casts
fix compilation

that this was so difficult to track down is an issue with rpython.
trying to fix that next. (thanks #pypy!)
add character literal tests
yah, run_blocking works when translated
Merge branch 'master' into async-io
add pixie.string/split

somehow the `.split` method on strings doesn't work here, so we have to
use the rstring module directly.
some fixes and the like
fix travis
more travis stuff