Support Python 3

[item4]

@mitsuhiko want someone's PR

Issue

• Can we use six for keep same operation?
• Can we use tox for testing?
• Can we use coveralls for checking coverage?
• Can lektor's dependencies support py3?

[item4]

• Jinja2>=2.4 (O)
• click>=6.0 (O)
• watchdog (O)
• mistune (O)
• Flask (O)
• EXIFRead (O)
• inifile (???)
• Babel (O)
• setuptools (O)
• pip (O)
• requests[security] (O)

@mitsuhiko May I know inifile support py3? It's your library. but have any docs.

[mitsuhiko]

inifile supports Python 3.

Instead of using six please write a custom _compat module like in other libraries. Six pulls in a shitty hack on import hooks and that causes major pain on distribution.

[techdragon]

@mitsuhiko I assume the futures/futurize path is also a no go for supporting Python 3?.

[mitsuhiko]

@techdragon i'm fine with anything for as long as the code stays as clean as possible and nothing in python 2 degrades and does not pull in dependencies for achieving this feat.