Mention iTerm2.app support:

iTerm2.app sets TERM to xterm by default and the escape sequences work.

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Support Windows builds that set $^O to lower-case mswin32

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Extract core logic of set_titlebar() into _set()

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Add set_tab_title()

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Merge pull request #1 from melo/iterm2-support

Iterm2 support and other tidbits