Set coprocess file descriptors nonblocking to avoid deadlock in bug 2576
Use 'fast' path for ascii drawing but benchmarks with spam show it has no improvement on os 10.8
Revert to old text drawing methos
Clean up
Merge branch 'v2' of https://github.com/gnachman/iTerm2 into v2
Merge v2 in
Fix param order
Fix merge conflicts