Add Python 3 support

This requires at least 3.3, as I left the unicode literals in.
Remove compat import, as there is no compat
Merge remote-tracking branch 'asmeurer/python3'
Update README
fix for path resolution on Windows
remove empty line in the end
add new line in the end
minor change
Frame identifier delimiter is a null char

This is disallowed in paths on both *nix and Windows.
os.sep is the platform-independent path separator
Improved unicode detection and command-line options for unicode, color

Should fix #10
Fix unicode/color functions returning values for sys.stdout
use os.sep and add comments
Merge remote-tracking branch 'codelol/path' into path

Conflicts:
	pyinstrument/profiler.py
Merge branch 'path' into develop
Merge remote-tracking branch 'upstream/path' into path

Conflicts:
	pyinstrument/profiler.py
Windows command-line usage
Prepare for PyPI upload
Merge remote-tracking branch 'codelol/path' into develop

Conflicts:
	pyinstrument/profiler.py
Merge branch 'develop'