prepare next version
Merge pull request #36 from ticosax/back-to-dev

prepare next version
Bump version to 0.7 for docs
Added Python 3.4 to travis test matrix.
Added Appveyor config.
Removed 2.6 and 3.2 from Appveyor test matrix because they aren't installed there.
Added AppVeyor build status image.
Detect the shell on Windows better.